CRI stands for the quality of light and its ability to realistically reproduce the color of an object. The highest CRI value is 100. For LED street lights, usually CRI70 can meet your light quality requirements. Of course, we also offer the option CRI80 to better represent the color of the illuminated object. CCT (Correlated Color Temperature) is a measure used to describe the relative color appearance of LED light sources.

N series solar LED street light. N series solar LED street light adopts a similar two-in-one design. The first part is the LED street light, which is ZGSM’s N series high-efficiency LED street light. It provides excellent lumen output for the solar street light system. The second part is the lithium battery and solar panel, which ensure continuous conversion of light energy into electricity and provide long-lasting battery life for the lamp. In addition, ZGSM provides a 3-year warranty for the solar street light system.

Incident lightmetervsspot meter

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OK let m see if I can explain this without tripping over my own tongue :)) A gray 18% gray card to the camera represents a average light value of a scene with relatively balanced tones from black to white. The neutral gray in measuring a scene represents no more than a average reflective light reading ( the meter dome averages the light values)! When you measure in incident mode, with the dome toward the camera, the dome is what averages your light and you will not need any adjustments for tonal values. When you measure in reflective mode, you are not measuring the average light value but you are reading the actual value as if it were 18% gray, therefore you need to adjust for it's tonality. Spot metering can be more accurate if you are a good judge of the actual tonal value of the object, but I have see very few people who can do that effectively. Spot metering is great for establishing the lighting ratio and highlights as well as tonal values in general. Originally posted ages ago. (permalink) Alfredk edited this topic ages ago.

Squares are an important part of people’s lives, people spend more time dancing/chatting/playing in squares at night, so square lighting has become very necessary. Plaza lighting usually uses LED area lights and LED flood lights, but there are also many LED street light manufacturers that have also developed light distributions suitable for plaza lighting to reduce costs and expand the variety of product functions.

Incident lightmeter app

Rifle series street light. The rifle series street light is a new generation of street light from ZGSM, which adopts high-efficiency LED lamp beads. The product can be equipped with Zhaga or NEMA socket, which is convenient for customers to equip their lamps with intelligent lighting control systems in the future. At the same time, the products have a series of certifications, including ENEC, CE, CB, RoHS, etc. At present, our company is also doing ENEC+ certification to meet the requirements of customer projects for this. Many customers of ZGSM currently choose this street light to bid on government projects, which is mainly based on its high-cost performance and complete certificates and reports.

If you spot meter something, you can expose over that reading 2 + 1/3 to 2 + 1/2 stops, you'll not blow out whatever you meter. This is useful for metering the brightest thing in a scene you dont want to blow out. ages ago (permalink)

Re. the 18% grey fact - it's more of a myth than a fact. Light meters are calibrated to ANSI standards, not the level of reflective level of piece of card that's printed with 18% grey. However, the principle of it is correct. Re. hand held meters with spot meters, they can be very useful indeed where you have a scene with a range of tones that you want to capture the detail of. Many of these have the ability to store/memorise a number of measurements and then produce an "average" (mean/weighted mean etc) of them and represent the measurements against a scale of F stops. If you know your camera's dynamic range, or have a Sekonic L-758 that has been profile with the camera & lens, then you can be confident that your exposure can capture those varied detail areas. ages ago (permalink)

As the project side and the owner side, price is very important, so ZGSM also attaches great importance to the price of types of street lights. We have different street light designs, so the price varies with different series. This is also to meet the needs of different customers. They can choose accordingly according to the project budget. If you are interested in the price of street lights, please refer to How much do the street lights cost?

L series post top light. L series post top light is designed with European elements, in addition to column top installation, it can also support 3 other installation methods, pendant installation, side entry installation, and suspension installation. These characteristics of ZGSM’s L-type street lights make them very suitable for various applications, including parking lots, courtyards, parks, playgrounds, pedestrian streets, and sidewalks. At the same time, its special installation method can be used to replace some old lamps very easily, and its application has been expanded. In addition, the toolless opening design of the L model is convenient for maintenance and future upgrades.

H series LED street lights are the best among all the types because they produce more bright light, less heat, and last for years. Contact ZGSM, the best LED street light manufacturer to acquire high-quality lighting solutions.

Reflectivelightmetering

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My name is Taylor Gong, I’m the product manager of ZGSM Tech. I have been in the LED lights industry for more than 13 years. Good at lighting design, street light system configuration, and bidding technology support. Feel free to contact us. I’m happy to provide you with the best service and products.

Incident light meter reading-The meter in giving a properly exposed 18% gray if you have a gray card in the scene. Since the meter can't tell what you are metering it is not effected by the subject just as you stated. So if you have a white subject that is reflecting back more light than a gray card would the camera will record this greater amount of light as a properly exposed white in the photo. No guessing as to what value to place the white as you would do with a reflective meter reading. This of course is in a perfect world where the white is not reflecting so much light back that it will blow out or the shadow won't block up. Your film or sensor has a limited range of tone that it can record. The wider reflective attachment for the meter allows you to get an average meter reading of the entire scene. This averages the shadow areas and the highlights as well as the mid tone to hopefully give you a pretty good guess at the right exposure. General rule when your able to walk up to the subject and use the incident meter us it. If the subject is to far to use the incident meter use the reflective. And don't forget to use your histagram on your digital camera to confirm your meter reading. Hope this helps ages ago (permalink)

Light efficiency is an important parameter of LED lamps. As mentioned in the previous section, we can replace 250W high-pressure sodium lamps with 100W LED street lamps. Because the high light efficiency of LEDs is the important reason. For example, in 201, the light efficiency of LED lamps was generally around 120lm/W, and now the light efficiency of LED street lights can reach 150lm/w, which means that we can use 80W LED street lamps to achieve 100W street lights in 2015.

With the development of the economy, automobiles have become the main means of transportation for the public. Some shopping malls, supermarkets, and hospitals will be equipped with parking lots to provide convenience for people, and the parking lot lighting is thus generated. Good parking lot lighting not only protects pedestrians but also makes a good impression to protect your business. LED street lights and post-top lights provide bright, energy-efficient lighting for parking lots of all sizes. Different parking lots also require lights with various mounting options, including straight-arm pole mounts, adjustable skid mounts, wall mounts, and more.

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If you still don’t know how to choose the right street light for your project, you can contact us for our help, we are very happy to share the corresponding knowledge with you and make the right choice.

2) Also, whether you're using reflective or incident, presumably you still need to be able to judge how far from neutral gray your subject is in order to use your meter creatively (i.e. to be able to intelligently deviate from the recommended reading). YES - this is why when metering skin tones, you have to compensate above middle grey. Think of reflective spot in your camera. You point that at a white wall and set the exposure so that its dead on. You will get a grey wall. Same thing with incident light meter. If that's the case, wouldn't a tight-enough (i.e. spot) reflective meter be just as useful as an incident meter, even in a studio? Not if you are using strobes - continuous light, yes. ages ago (permalink)

We know that any large warehouse and logistics area has a lot of space in front of the entrance to facilitate the passage of vehicles through the area. Therefore, this large space needs to be illuminated by lamps at night to avoid the existence of dark areas, otherwise, it may increase the driver’s blind spot and increase potential risks. At the same time, the loading and unloading area also needs enough lighting to guide the driver, which is also convenient for workers to load and unload goods.

1) The base (it is actually a part of the light pole, at the bottom of the light pole, its main purpose is to integrate the light pole and the ground to achieve the ideal appearance),

Wattage is usually an important factor for types of street lights. When other conditions (light pole height, road width, light pole distance, boom length, boom angle, distance between the light pole and the road) are all constant, the higher the wattage of the street light, the better the lighting effect. However, many people may be unfamiliar with how to choose the wattage of LED street lights. ZGSM believes that it can start from three directions.

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Both rural and urban areas have a variety of streets, such as primary streets, secondary streets, etc. Different street lamp situations require different types of street lights, different wattages, and different light distributions. As technology advances, LED street lights are a cost-effective and sustainable option for roads and paths in cities, towns, and rural areas.

When your street light is perfect in several aspects, it is in the competition of the project which it can win, and the different installation methods make its application range very wide. In recent years, with the maturity of LED technology, photocell and sensors are increasingly applied to LED street lights to achieve energy-saving and semi-intelligent functions. LED street lights with smart controllers can make your roads, squares and parks very advanced, and it will also make your city very modern.

Thanks for your reply, kamor. I don't fully understand your reply, though: are you saying an incident meter gives you a neutral gray reading or not? Can anyone else offer some additional wisdom on the above three questions? Originally posted ages ago. (permalink) Duncan K Moore edited this topic ages ago.

Components of a traditional street light: it consists of three elements – a base, a light pole and a street LED luminaire.

Reflected lightmetervs incident

CCT indicates whether the light source is yellowish, whitish, or bluish. The unit of CCT is Kelvin (absolute temperature unit). 2700K is “warm”, 4000K is “neutral” and 5700K is “cool”. More and more road lighting now requires 4000K, 3000K, 2700K, and even lower 2200K. This is because low color temperatures are thought to have less of an impact on humans, animals, and plants.

, nice explanation. I agree with as well. Kind of obvious, but I'll add that if you were to meter the three parts (of the gray card, where you were taking the incident readings) with a reflective meter, you'll get 3 different readings. This is prior to adding the flash. The black will be an over-exposure, the gray will be the correct exposure, and the white part will be an under-exposure. ages ago (permalink)

Halo series post top light. The Halo series post top light is a new generation of LED lights from ZGSM. Halo can be used as a post top light by the installation method of single arm and double arm, Halo of side entry can be used as a street light, and Halo with high bay installation can even be used as a high bay light. Therefore, its applications include parking lots, parks, city or town roads, or lighting in factories. At the same time, Halo has made improvements in heat dissipation, so that it can meet the heat dissipation requirements of lamps with fewer radiators, ensuring customers’ application requirements and providing customers with more economical solutions.

The expressway is the road connecting the city and the city, and the road connecting the city and the countryside. In this case, there will be no non-motorized lanes for motor vehicles and pedestrians. In addition, the road surface of the expressway is very smooth, there are no obvious potholes, the road condition is maintained well, and the safety factor is high. Therefore, most highways do not need to install street lights. At the same time, considering that the cost is too high, it is not suitable to install street lights on the highway.

Different types of street lights can be applied in a variety of situations depending on their appearance, installation method, wattage, and beam angle. These applications include main streets, residential streets, road intersections, plazas, parks, outdoor industrial and logistics areas, etc. Nowadays, LED street lights are becoming more and more fashionable, and high energy-saving LED lamps are designed to replace traditional HPS and MH lamps. We believe that when designing a successful street light, you need to pay attention to the aesthetics, wattage, light efficiency, light distribution, street lighting certification and CCT/CRI, etc.

Incidentmetering

Certification is good proof of whether the product meets the corresponding standard, or whether the product conforms to the parameter list. In terms of safety standards, for example, the most common requirements are whether LED street lights have CE and RoHS. European regions sometimes require ENEC certificates, while other regions require CB certificates. In terms of product parameters, such as light efficiency, heat dissipation, and waterproofing, the corresponding reports are LM79, ISTMT, and IP report. In terms of factory qualification, the most common is ISO9001, but ZGSM also provides ISO14001 and ISO45001. For other standard certificates or reports, see the table below.

There are several types of street lights, including LED street lights, high-pressure sodium (HPS) lights, metal halide lights, and solar-powered lights.

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@ I agree that it is a bit more complicated, but I was just trying to give a fuller explanation of how a light meter works -- And lightmeter placement in uneven light is an important consideration. If you place your meter in the highlight, you'll get a different reading than if you placed it in the shadow. It is stated very similarly in Wizwow's explanation of Light Meters. That article is a great resource. OP, I suggest you read that as well. That being said, I can semi-see your point. In practical terms, many people do just head for the chin and don't worry too much about transition zones. ( although I think they should put some thought into where they're sticking that meter) Originally posted ages ago. (permalink) Nick Arora Photo edited this topic ages ago.

Kmini and Kmini2 series street lights. Kmini and Kmini2 series street lights have been selling well for their excellent quality, good performance, and favorable price. In addition, Kmini street lights can save up to 70% of energy costs compared to traditional lighting, which makes them ideal for rural road lighting, parking lots, residential areas, industrial parks, and more. The streamlined design and smooth surface of this series of street lamps eliminate the influence of factors such as dust and dirt on the performance of the lamp. At the same time, the Kmini street light led is small in size, easy to transport, and greatly reduces transportation costs. It is an ideal choice for many customers with high-cost performance requirements.

dankanmooa:[...] I also know that with incident, you put the meter where your subject is (or in a place receiving the same light as your subject), and point the dome at the camera, to measure the amount of light falling on the subject [...]. In my opinion, this is not a way to measure the light falling on the subject, but to (arbitrarily) average it from the camera's POV! Some sort of reverse centre-weighted averaging for flash exposure, whereas the centre is not the centre of the frame anymore, but of the subject... Yes, I know, that's the way recommended by the pros, therefore that's also the way recommended by the meters' manufacturers. More often than not, the light doesn't fall uniformly on the subject, so there's no single correct exposure for the subject as a whole. To measure lights falling on the subject at a certain spot, put the meter on that spot with the dome pointing along the surface's normal (ie., away and perpendicular to the surface); this way the dome will average the lights falling on that spot and give you the correct exposure for that spot. Putting the meter in the transition area will give you the correct exposure for somewhere in the middle of the transition area (which I think it's quite arbitrary, but could - randomly - yield pleasant results nevertheless, especially if you skew the measurement's results according to your taste). For me it makes more sense for a (geek) photographer to consciously choose the reference spot, that one spot with the perfect exposure, according to her intent and mood, according to the desired point of interest on her subject, or at least according to some reference feature of the subject itself (colour, relevant detail, texture, etc), not according to the previously chosen camera angle. Choose that spot, put the dome there and point it away from the surface, regardless to where the camera happens to be, take the measurement then expose as measured. Edit: measuring and exposing "for the key light" is just a particular case of the principle stated above, based on the assumption that the key light is the only one creating the key diffuse reflection, which is also the reference spot - if I make any sense this late in the night... Edit: BTW, make sure you check this guy out, if by any chance you didn't already. Quite a show. Originally posted ages ago. (permalink) ☣ cUKi edited this topic ages ago.

Street lighting can be used for preventing road traffic crashes and injuries. Because the motorways will be evenly lit by the street lights after installation. Btw, the visibility and safety of pedestrians are both enhanced by street lighting. Even after the trees get huge and tall, the sidewalk can be illuminated by the street lights.

Track lighting systems provide the most flexible solution for ambient, task, accent lighting and wall washing in offices and hospitality spaces.

The main component of the city lighting project is street lighting. The lighting of street lights is especially significant at night. Currently, traditional street lighting are being phased out in favor of LED street lights. Because of its great luminous efficiency, long life, low energy consumption, and ease of installation, led street lights are widely employed.

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Through this article, I hope you have a certain understanding of different types of street lights and their application places. At the same time, when choosing types of street lights, I believe that everyone has a certain consideration of important factors. The main function of public lighting is to ensure the safety of users on roads and outdoor places and increase the vitality of the city. Different places often require different LED street lights to ensure that they meet the lighting and aesthetic requirements of the application site.

Reflectedmetering

From oil lamps in ancient Rome to cutting-edge LEDs, street light history spans millennia. Wealthy Romans utilized oil lamps, while London’s 1417 mandate marked early organized public lighting. William Murdoch’s 1802 gas light innovation paved the way for efficient illumination. Baltimore and Paris introduced gas streetlights, while Paris pioneered electric arc lamps in 1878, replacing gas. Edison’s vacuum bulb led to incandescent streetlights. Low-pressure sodium lamps arrived in the 1930s. Holonyak’s 1962 LED breakthrough marked a turning point. High-pressure sodium lamps dominated until LEDs surged. Modern LEDs outshine HIDs in efficiency and longevity. This journey, from ancient glow to LED brilliance, reflects remarkable progress.

That’s why many projects or tenders have clear requirements for lighting efficiency. The main reason is that high light efficiency means that we can achieve the desired lighting effect with less energy consumption. It is also clear in these bidding documents that different light effects can have different scores. High light efficiency means that you can compete with many competitors and stand out.

RE the 1st question: ==== 1) Here's where I get confused: whereas it's always explicitly stated that a spot meter will give you a neutral gray reading, I've had people tell me that an incident meter doesn't work the same way: the reading it gives will be the correct exposure. That feels wrong to me: even though incident readings aren't affected by the different levels of reflectivity of different objects in your frame, the meter surely still needs a baseline (neutral gray, presumably) to use in recommending a reading. Right? In short, though reflective and incident meters use different methods to read the light, am I right in thinking that they both recommend a neutral gray exposure? ==== With “neutral gray” I am going to assume you mean the “correct mid-tone” as “neutral gray” is more of a descriptor for a spectrally neutral target you use to set white balance. I think what you are referring to is a target that is “averaged out” to reflect exactly 18 percent of the light that strikes it. The two are often used interchangeably but there are technical advantages to have a white balance target that reflects a whole lot more than 18 percent of the light that strikes it. What is important for a white balance target is that it is spectrally neutral. An exposure target, on the other hand doesn’t have to be as long as it reflects 18 percent. Next, you refer to a spot meter. The objective of spot metering will differ, depending on the type of spot meter you use. If you use a hand-held spot meter, such as the Sekonic 758 or the Sekonic 358 (with spot very narrow optional spot reading attachment – not the lumigrid that comes with the meter, I mean the optional accessory) you take a reading of the lightest point in the scene and a reading of the darkest point in the scene, respectively in addition to a mid-tone reading. For this, no “averaging” is required as the operator of the meter (you) know exactly what you are pointing the meter at. It is only a "dumb" camera that need to "average" out an ENTIRE SCENE. You are not metering an entire scene when you use a spot meter. Now, about the terms. You can operate a Sekonic 358 with the lumisphere in two different modes. 1: With the sphere extended, in which case you are taking incident reading for 3 dimensional objects (like a face) 2: With the sphere retracted in which case you are taking incident readings to check that a flat surface is lighted evenly or for when you are working out lighting ratios and you have several strobes going off at the same time and you want to measure the light from each strobe separately. This is not to be confused with the Sekonic operating with the lumigrid. When the lumigrid is attached, the Sekonic measures reflected light. With the lumisphere attached, it measures incident light. The 18 percent average reflectance target is only required when metering reflected light. To be more specific, when you are measuring incident light, you are measuring illuminance. Illuminance is measured in lux. When you are measuring reflected light, you are measuring luminance. Luminance is measured in candelas per meter squared. === RE the 2nd question 2) Also, whether you're using reflective or incident, presumably you still need to be able to judge how far from neutral gray your subject is in order to use your meter creatively (i.e. to be able to intelligently deviate from the recommended reading). If that's the case, wouldn't a tight-enough (i.e. spot) reflective meter be just as useful as an incident meter, even in a studio? ==== If you want to perform such judgements, you are using the zone system, in which case you need to “judge” where zone V e.g. the mid tone lies in a scene. You then point a spot meter at the object in zone V in the scene, get an exposure value, and open up or stop down from there based on your “creative vision” When you are working in a studio, with strobes, use a hand-held, incident light meter for repeatable, and consistent accuracy. It will give you the exposure value for a mid-tone and that is what you set your camera to. Now, digital camera sensors will clip some shadows or clip some highlights because the dynamic range of the sensor cannot handle every subject brightness range, even though it will have accurate details in the mid-tones. Once again, in such a case you can either compensate by changing the way your lights are lighting specific areas of the scene as to decrease the contrast range – OR – make a “creative” judgement on what is more important: detail in the highlights or detail in the shadows, and open up or close down your aperture accordingly. If you want to nail it “perfectly” for your camera, get a Sekonic 758 + the Sekonic calibration target and perform the calibration procedure for your specific camera sensor using the Sekonic software. You can only do this with the 758 though as it is the only current model with a USB interface that can talk to the Sekonic software on your computer. Once you have performed this procedure, the meter will tell you if you exceed the dynamic range of your sensor and by exactly how much in both the shadows and the highlights. Even so, the 758 is not entirely perfect in that it uses JPGs and not RAW for its calibration procedure. That might be due to the fact that the ISO standard camera manufacturers use to determine the ISO sensitivity values for their sensors require JPG. Remember that one of the inputs any light meter use is ISO. It has to do with setting the saturation point for exposure calibration, but that is another, and very complicated story.... Originally posted ages ago. (permalink) BooBooMoo edited this topic ages ago.

In the following special cases, such as high-speed entrances and exits, bridges on high-speed roads, roundabouts, etc., high-power street lamps can be used to provide necessary lighting for drivers to drive safely. For roundabouts, we probably need to install flood lights instead of street lights. And the installation height of flood lights can reach 12-15m or higher.

In some cases, light poles and lamps are combined to achieve the desired aesthetic and engineering effects. Such lamps are generally used for lighting sidewalks, industrial parks, parks, parking lots, etc. In other cases, the light pole and the lamp are separated, which is more common in road lighting.

Nice explanation. But IMHO everything between: Let's add flash and make it more complicated... and: ... Final note Is over complication and not practical. The reading under the chin AFAIK is about getting the distance exactly right without slamming your meter into the models face. YMMV Bill. ages ago (permalink)

Here's my (very basic) understanding of incident light meters: CAVEAT: If I'm wrong, I'd love to be corrected! (I need to know this stuff as much as anyone else :) ) An incident light meter pointing back at the camera basically asks, "Assuming the subject is standing in the same light as my dome, what camera settings do you need to expose properly for the shadows, midtones, and highlights?" So let's take a simple example first. You have an evenly lit grey card. no highlights, no shadows, just nice even light. Your human eye sees this: If you put your light meter here: here: or here: you will get the same exposure: Why? Because the same even light is hitting the meter's dome at all three points. Let's add flash and make it more complicated. Let's assume you managed to set up a flash that lit exactly one half of your subject, the grey-card target. If you placed your flash on the side that wasn't being lit by your flash, your image would probably be "overexposed." [I put "overexposed" in quotes because, in reality, there is no "correct" exposure - its all creative choices. That may be the look you are going for. Essentially, placing your meter in the shadows opens up the "shadow" area and makes the lit areas brighter.] if you placed your flash on the side that was being lit by flash, your image would probably "underexpose" (again, this is a creative choice). If you place your flash with the dome extended in a transition area between light and dark light, you will get a nice average of the two. This is why many people recommend placing the meter below the chin of a subject for a portrait. Often the chin is a nice round transition zone that contains highlights and shadows. Final note: a light meter reading isn't necessarily what you want to put in your camera as your "final exposure." It can give you a starting point, but you have to think about your exposure - and decide how you want it to look. Anyway, hope that helps - and people please add your corrections. I know I'm capable of mistakes Originally posted ages ago. (permalink) Nick Arora Photo edited this topic ages ago.

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Nova series street light. Nova series street light is ZGSM latest generation street light. It is modern and beautiful outdoor lighting, ideal for residential streets, sidewalks, parks, playgrounds, and other lighting places to provide the ultimate solution. Nova series led street lights have a unique visual appearance and reliable performance. At the same time, it has a lightweight design and stable performance of lamp beads and drivers. It is a very cost-effective product. As the company continues to refine its certification, we believe it will become a hit in the years to come, making it the ideal streetlight choice for lighting designers, contractors, and end users.

Hey everyone, Three light meter questions here. Sorry for the long post: better than several threads, I thought. I've recently been learning how to use a light meter. Like a million others, I got the Sekonic L-358 and am using it with my SBs and Lighting 102 homework. The L-358 has both reflective and incident capabilities. I know that with reflective, you point the meter at the subject to measure the amount of light bouncing off it. Because the meter isn't intelligent, it gives you the exposure needed to render the subject neutral gray. From there, you decide how far above or below neutral gray you're aiming for, and adjust accordingly. I also know that with incident, you put the meter where your subject is (or in a place receiving the same light as your subject), and point the dome at the camera, to measure the amount of light falling on the subject. --- 1) Here's where I get confused: whereas it's always explicitly stated that a spot meter will give you a neutral gray reading, I've had people tell me that an incident meter doesn't work the same way: the reading it gives will be the correct exposure. That feels wrong to me: even though incident readings aren't affected by the different levels of reflectivity of different objects in your frame, the meter surely still needs a baseline (neutral gray, presumably) to use in recommending a reading. Right? In short, though reflective and incident meters use different methods to read the light, am I right in thinking that they both recommend a neutral gray exposure? --- 2) Also, whether you're using reflective or incident, presumably you still need to be able to judge how far from neutral gray your subject is in order to use your meter creatively (i.e. to be able to intelligently deviate from the recommended reading). If that's the case, wouldn't a tight-enough (i.e. spot) reflective meter be just as useful as an incident meter, even in a studio? --- 3) Finally, the reflective attachment supplied L-358 gives an angle of view of 54º. On a crop-sensor Nikon, that's a 28mm lens; and on 35mm film/full-frame digital, it's 42-43mm. In other words, the L-358's reflective field of view matches a lens that's too wide for most portraiture and too long for most landscape shooting. Does anyone know the logic behind making a reflective meter like that? Is it just to trap people into needing the extra spot attachment? (I'm mainly asking about this because I recently bought a manual, medium format, film camera and feel like a spot meter would be pretty handy for landscapes, whereas the L-358's reflective attachment feels pretty ill-suited to the job.) All the best, dankanmooa Originally posted at 6:35PM, 16 April 2010 PST (permalink) Duncan K Moore edited this topic ages ago.

For example, in our range of Rifle, we have T2S53001, T3S53002, T3S53003, T2M53007, T3M53009, T2S55004, T3M55005, T3S55006, T2M55008, T3M55010 spectra, which give good light uniformity in the above applications.

Alfredk is right. I did a simple test and pointed my l-358 at a white sheet of paper took a reading and matched my camera to the aperature/shutter speed/ISO of the light meter and the exposure resulted in the paper staying white not grey. ages ago (permalink)

PV3 series solar street light. PV3 all-in-one solar street light adopts an integrated design, which integrates solar panels, lithium batteries, controllers, and LED lights, which finally can greatly facilitate customer installation. PV3 supports both horizontal and vertical installation. The overall lighting efficiency of PV3 is 200lm/W, which can greatly reduce the power consumption of the system, and the lamps are equipped with relatively small batteries to reduce costs. The conversion efficiency of the monocrystalline silicon panel used in PV3 is about 23%, and it can reuse renewable resources such as solar energy. In conclusion, it is an ideal choice for lighting on rural roads or remote mountainous areas.

A ring light is used with the camera to improve the lighting and therefore the quality of the photos you take -mostly for portraits and ...

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The incident meter is calibrated to give you a properly exposed gray card if you have a gray card in the scene. So if you have a tree trunk that is 1 stop darker that 18% gray it will record properly because it is reflecting 1 stop less light so no adjustment to the exposure is needed on your part. If you have highlights that you want to record as white with some detail and their recording 3-4 stops over your incident reading you may have to adjust your camera setting to get them to record the way you want them. A lot of the time I'm using both the incident and reflective meter reading to control my scene when using artificial lights. I will take a incident meter reading to get the base exposure settings, then I will take reflective meter readings of the background etc and adjust my lights to get the exposure relationship between the subject and background. If you take a incident meter reading of a subject in a bright white dress and your meter reading is f8 and then you take a reflective meter reading of the dress itself and you get a reading of f22 you know the dress will record 3 stops brighter than 18% gray so you will have to adjust the exposure (stop down) to record the dress with some detail. ages ago (permalink)

These Types of street lights are often used at road and street intersections so that drivers must make quick decisions when they spot potential hazards. In this case, LED street lights should be placed at intervals to keep the light even and eliminate the driver’s eyestrain. When necessary, high mast lights can be set up at intersections to provide necessary lighting for drivers and pedestrians.

Incident light vstransmittedlight

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H series street light. H series LED street lights are ZGSM’s most successful products at present and have sold nearly 500,000 units in more than 100 countries around the world since their launch. The product adopts a module design, which is very conducive to the maintenance of lamps. Since the light source and LED power supply are placed separately, the lamp has a very good heat dissipation performance. The combined use of high-quality LUMILEDS LEDs and Inventronics programmable LED Drivers greatly extends the lifespan of this street light.

Hi, Some random comments; "....it's always explicitly stated that a spot meter will give you a neutral grey reading...." Spot metering is calibrated assuming that your target was middle grey or of equivalent tone & reflectance. If your target differed then you take responsibility for applying a correction. "....need to be able to judge how far from neutral gray your subject is...." Be careful with your thinking here - under incident metering, you may want a lighter tone to register as a lighter tone - so perhaps no correction would be the creative/intelligent option. "....In other words, the L-358's reflective field of view matches a lens that's too wide for most portraiture and too long for most landscape shooting...." Correct, but, if you have a portrait lens on cam, you can (reflective) meter from (say) half the shooting distance. But yes, that's one of the reasons that TTL metering can be so useful. Cheers Originally posted ages ago. (permalink) LayerMask edited this topic ages ago.

They mainly refer to the roads that pedestrians and non-motor vehicles pass through. Usually, this type of lighting is combined with road lighting. During lighting design, motor vehicle lanes, non-motor vehicles, and sidewalks will be arranged according to the requirements of the project. Usually, a light will be set up to illuminate non-motorized lanes and sidewalks. The purpose of setting lighting on such roads is to provide safe and comfortable lighting conditions for pedestrians and consumers. Lighting should enable pedestrians to walk safely, recognize each other’s faces, locate them correctly, and prevent criminal activity.

Street light LEDs are mainly used to illuminate urban/rural roads and some other outdoor areas, generally reducing road accidents and increasing residents’ sense of safety. For suppliers, types of street lights with different wattages and different light efficiency are not enough to meet the needs of different customers. Customers usually require a street light that can be adapted to illuminate different road conditions. ZGSM’s LED street lights provide a wide light distribution, suitable for different roads, such as urban roads, and country roads. It can also be used for area lightings such as parking lots and parks.

OK, lets simplify! When Adam Ansel recommended 18% gray it was because 18% gray represents the average luminosity of a tonally well balanced scene! So when measuring a gray card in reflective mode, one can "assume" that all the tones, lit by the same light as the gray card, will be exposed correctly. When metering in incident mode, the dome of the meter averages the light and and it should (if conditions are good) be the same reading as you would get from reading the gray card directly. When you read any other tone than 18% gray, the reflected value will be different and an adjustment has to be made to place that object in the correct range of tones. I would recommend reading this....... www.normankoren.com/zonesystem.html Most people will say that the Zone system is obsolete, ok perhaps so, but it is imperative to know the basics of it if you like to use a meter successfully! ages ago (permalink)