(25) Reflection Factor: When a ray of light impinges on a surface it is reflected from the surface at an angle of incidence, as shown in Fig. 7.4. A certain portion of incident light is absorbed by the surface. The ratio of reflected light to the incident light is called the ‘reflection factor‘. It is always less than unity.

(21) Depreciation Factor: This is merely the inverse of the maintenance factor and is defined as the ratio of initial metre- candles to the ultimate maintained metre-candles on the working plane. Its value is more than unity.

Brightness or luminance is defined as the luminous intensity per unit projected area of either a surface source of light or a reflecting surface and is denoted by L.

IR Illuminator for night vision

An IR light from Black Oak uses an LED that pumps out infrared light. Powered by 12V DC power supplies, these lights are the perfect addition to a boat navigating at night, an ATV patrolling a ranch, or any security vehicle where stealth is important. With the help of a low-voltage transformer, similar to what you would use for landscape lighting, these bars can intensify the outdoor security system around your home or business.

Thus solid angle subtended at a point can be determined directly from the above relation knowing the plane angle subtended by its section.

While infrared light may not be of much use on its own, paired with a camera it can be invaluable. This technology is commonly found among the military where they need to work at night as well as they can during the day. Using night vision with IR light is typically the chosen technique as the light uses less energy than visible light, and it is undetectable by the naked eye. The military equips many of their vehicles with infrared specific lights as they need their cameras to have the most range and detail possible. Have enough IR lighting everything up from different angles and you may think it's daylight when you look at the screen of the camera.

i.e., nit is defined as candela per square metre. Bigger unit of luminance is stilb which is defined as candelas per square cm. Lambert is also the unit of brightness which is lumens/cm2. Foot-lambert is lumens/ft2.

(9) Candela: It is the unit of luminous intensity. It is defined as 1/60th of the luminous intensity per cm2 of a black body radiator at the temperature of solidification of platinum (2,043 K).

Note: While we are able to display real time shipping costs for most items, larger items that must ship freight require additional fees. Simply add the items to your cart and place your order. Within 1 business day we will contact you with a shipping quote for your items.

Best IR illuminator for night vision

(18) Space-height Ratio: It is defined as the ratio of horizontal distance between adjacent lamps and height of their mountings.

The largest solid angle subtended at a point is that due to a sphere at its centre. If r is the radius of any sphere, its surface area is 4πr2 and the distance of its surface area from the centre is r, therefore, solid angle subtended at its centre by its surface,

(6) Illumination: When the light falls upon any surface, the phenomenon is called the illumination. It is defined as the number of lumens, falling on the surface, per unit area. It is denoted by symbol E and is measured in lumens per square metre or lux or metre-candle.

You can use white lights for hunting, but they come with a big drawback: all animals can see them. More importantly, animals can see the shadows cast by white light shining. If you are hunting at night, then IR lighting is the absolute best option. Hook up your light bar, choose your optics, and you will be ready to rule the night.

(10) Mean Horizontal Candle Power (MHCP): It is defined as the mean of candle powers in all directions in the horizontal plane containing the source of light.

The first step in night hunting and surveillance is to pair night vision goggles or optics with IR lighting. Most goggles and optics magnify IR light, so when you pump out IR light, the perceived brightness in your vision goes way up. Of course, the infrared light has virtually no visible signature, so it will not alert whatever you might be hunting or watching.

(16) Brightness or Luminance: When the eye receives a great deal of light from an object we say it is bright, and ‘brightness’ is an important quantity in illumination. It is all the same whether the light is produced by the object or merely reflected from it. The object sends out light as though each small piece of its surface were of a certain luminous intensity. Generally, the brightness of an object is not the same from all points of view. When brightness is considered in terms of measurable quantity, the term luminance is employed.

IR Light bulb

(20) Maintenance Factor: Due to accumulation of dust, dirt and smoke on the lamps, they emit less light than that they emit when they are new ones and similarly the walls and ceilings, etc., after being covered with dust, dirt and smoke do not reflect the same output of light, which is reflected when they are new.

Illumination differs from light very much, though generally these terms are used more or less synonymously. Strictly speaking light is the cause and illumination is the result of that light on surfaces on which it falls. Thus the illumination makes the surface look more or less bright with a certain colour and it is this brightness and colour which the eye sees and interprets as something useful, or pleasant or otherwise.

(1) Light: It is defined as the radiant energy from a hot body which produces the visual sensation upon the human eye. It is usually denoted by Q, expressed in lumen-hours and is analogous to watt-hours.

Black Oak Lithium - the new standard in marine power. This lineup delivers on the quality and performance you’ve come to trust from our brand.

Some bodies reflect light in some measure, and when illuminated from an original source they become secondary sources of light. A good example is the Moon, which illuminates the earth by means of the reflected light originating in the Sun.

(2) Luminous Flux: It is defined as the total quantity of light energy emitted per second from a luminous body. It is represented by symbol F and is measured in lumens (or cd-sr). The conception of luminous flux helps us to specify the output and efficiency of a given light source.

(5) Candle Power: Candle power is the light radiating capacity of a source in a given direction and is defined as the number of lumens given out by the source in a unit solid angle in a given direction. It is denoted by symbol CP.

The devising of modern lighting schemes and the selection of fittings and types of lamps requires a knowledge of the terms and quantities in general use for such purposes. Therefore, the following definitions are given in simple form to facilitate easy identification and reference.

IR driving lights are brilliant for ATVs, UTVs, and off-road vehicles. Black Oak LED light bars have a beam pattern specifically designed to blend flood and spotlights together to provide long-distance center vision with solid peripheral vision. They can be added to security and law enforcement vehicles to make nighttime patrols more effective.

(23) Absorption Factor: In the places where atmosphere is full of smoke fumes, such as in foundries, there is a possibility of absorption of light. The ratio of total lumens available after absorption to the total lumens emitted by the source of light is called the absorption factor. Its values varies from unity for clean atmosphere to 0.5 for foundries.

If F is the luminous flux radiated out by source within a solid angle of ω steradians in any particular direction then I = F/ω lumens/steradian or candela (cd).

IR lights, bars, cameras, and googles are transforming the way people work, navigate, and hunt at night. A combination of IR lights and optics will allow you to do everything you do in the day, but in the dark.

Another common use for IR technology is in security systems. Have you noticed that your cameras still work at night when you can't see anything yourself? If you examine your cameras, you are likely going to find a few unlit LEDs on the face. This is how it happens. These infrared LEDs emit the light we can't see but that allows the cameras to still pick up the burglar snooping through the yard. If your camera system doesn't quite have the range to see the other side of your yard or provide the detail you desire, consider adding another infrared light source instead of replacing the entire system.

Colour: The sensation of colour is due to the difference in the wavelengths of the light radiations. Visible light can have a wavelength between 4,000 Å and 7,500 Å and the colour varies in the way, as shown in Figs. 7.1 and 7.2.

(13) Reduction Factor: Reduction factor of a source of light is the ratio of its mean spherical candle power to its mean horizontal candle power.

Our team of experts is always available to help. If you've got questions about which light to buy or how to build your ideal system, give us a ring. We'll talk you through your options and help you make the best choice.

(4) Lumen: The lumen is the unit of luminous flux and is defined as the amount of luminous flux given out in a space represented by one unit of solid angle by a source having an intensity of one candle power in all directions.

Solid angle is the angle generated by the surface passing through the point in space and the periphery of the area. Solid angle is denoted by ω, expressed in steradians and is given by the ratio of the area of the surface to the square of the distance between the area and the point.

With our ultra-rugged waterproof aluminum housing, you can mount an IR light bar to your boat to make nighttime navigation safer. With a camera package or night vision optics, you'll be able to spot other vessels, channel markers, and navigation hazards thanks to the optimal visibility provided.

(15) Specific Consumption: It is defined as the ratio of the power input to the average candle power. It is expressed in watts per candela.

IR Pod Light - These small pods can be perfect for discreet installations for security or as vehicle mounts on smaller vehicles.

We can't describe the light output in lumens, but these homeowners and hunters have been very pleased with the improvement in their vision.

IR light for security Camera

(3) Luminous Intensity: Luminous intensity in any given direction is the luminous flux emitted by the source per unit solid angle, measured in the direction in which the intensity is required. It is denoted by symbol I and is measured in candela (cd) or lumens per steradian.

(27) Steradian: It is the unit of solid angle and is defined as the solid angle that subtends a surface on the sphere equivalent to the square of the radius.

Nature of Light: Light is a form of radiant energy. Various forms of incandescent bodies are the sources of light and the light emitted by such bodies depend upon the temperature of bodies. Heat energy is radiated into the medium by a body which is hotter than the medium surrounding it. The heat of the body, as seen, can be classified as red-hot or white-hot. While the body is red-hot the wavelength of radiated energy will be sufficiently large and the energy available is in the form of heat. When the temperature increases the body changes from red-hot to white-hot state, the wavelength of the energy radiated becomes smaller and enters into the range of the wavelength of light.

IR Light for Camera

(8) Foot-Candle: It is also the unit of illumination and is defined as the luminous flux falling per square foot on the surface which is everywhere perpendicular to the rays of light from a source of one candle power and one foot away from it.

Relative Sensitivity: The sensitivity of the eye to the lights of different wavelengths varies from person to person and according to the age. The average relative sensitivity is shown in Fig. 7.2. The eye has greatest sensitivity for wavelengths of about 5,500 Å ; that is, yellow-green can be seen under poor conditions of illumination when blue or red cannot be seen under dim illumination, the sensitive curve tends to shift, as shown by the shaded region in Fig. 7.2. Therefore, violet disappears first and red remains visible. Yellow disappears last as the illumination becomes very dim. As each colour disappears, it becomes a grey shade, and finally black. The sensitivity of the eye to yellow-green radiation is taken as unity or 100% and the sensitivity to other wavelengths is expressed as a fraction or percentage of it. The relative sensitivity at any particular wavelength λ is written Kλ and is known as relative luminosity factor.

(7) Lux or Metre-Candle: It is the unit of illumination and is defined as the luminous flux falling per square metre on the surface which is everywhere perpendicular to the rays of light from a source of one candle power and one metre away from it.

To ship to your country, simply click Add to Cart for all items you wish to buy, then click Checkout and enter your shipping address into the Checkout page including your country. The Checkout page will generate a shipping rate which will be added to your order. Once you have completed the Checkout we will send you a confirmation email with your order details.

Black Oak offers many lighting options. In addition to the products we already mentioned, you can buy a kit with our night vision camera and clamp-on light. This is an easy install and will boost your boat navigation and site security immediately.

Our IR light bars and pods produce a beam of energy at 850 nanometers, which is considered invisible energy. They are widely used in the military, security service, and public safety industries.

Black Oak lights are the best on the market. The key ingredient is our use of real infrared bulbs as a light source. Lesser products use regular bulbs with an IR filter. This diminishes the total light output, making them much dimmer and less suitable for long-distance lighting.

Light may be produced by passing electric current through filaments as in the incandescent lamps, through arcs between carbon or metal rods, or through suitable gases as in neon and other gas tubes. In some forms of lamps the light is due to fluorescence excited by radiation arising from the passage of electric current through mercury vapour.

Our lights produce high output with very little power consumption. It's not easy to measure this as lumens because the light is invisible to the naked eye. But here's what our customers are saying:

(12) Mean Hemispherical Candle Power (MHSCP): It is defined as the mean of candle powers in all directions above or below the horizontal plane passing through the source of light.

Our lights are built in a durable Dynamax housing, use a super effective Lexan lens, and have flexible mounting brackets to be adapted to almost any installation. We're so confident in our products we back them with a 30-day money back guarantee and a lifetime warranty.

Best IR illuminator for ATN 4k Pro

The beam consists of pure infrared light, so there is no visible signature to spook game or alert intruders. It also protects your night vision, so you won't be dazzled if you suddenly glance up at the light bar. All the illumination comes from IR LEDs, so no visible light is made by the light bar itself.

(17) Glare: The size of the opening of the pupil in the human eye is controlled by its iris. If the eye is exposed to a very bright source of light, the iris automatically contracts in order to reduce to amount of light admitted and prevent damage to retina ; this reduces the sensitivity, so that other objects within the field of vision can be only imperfectly seen. This effect is referred to ‘glare’ and is familiar in connection with motor-car headlights. In other words glare may be defined as the brightness within the field of vision of such a character as to cause annoyance, discomfort, interference with vision or eye fatigue.

(24) Beam Factor: The ratio of lumens in the beam of a projector to the lumens given out by lamps is called the beam factor. This factor takes into account the absorption of light by reflector and front glass of the projector lamp. Its value varies from 0.3 to 0.6.

(11) Mean Spherical Candle Power (MSCP): It is defined as the mean of candle powers in all directions and in all planes from the source of light.

These lights benefit from the use of an LED designed to emit light in the infrared range while other lights often have filters applied that instead block visible light from getting out. By using infrared diodes, all the power supplied goes to producing IR light greatly increasing the intensity and range of your night vision. Powered by 12V DC power supplies, these lights are the perfect addition to a boat navigating at night, an ATV patrolling a ranch, or any security vehicle where stealth is important. With the help of a low-voltage transformer, similar to what you would use for landscape lighting, these bars can intensify the outdoor security system around your home or business.

Light is the prime factor in the human life as all activities of human beings ultimately depend upon the light. Where there is no natural light, use of artificial light is made. Artificial lighting produced electrically, on account of its cleanliness, ease of control, reliability, steady output, as well as its low cost, is playing an increasingly important part in modern everyday life. Apart from its aesthetic and decorative aspects, good lighting has a strictly utilitarian value in increasing production, reducing workers fatigue, protecting their health, eyes and nervous system, and reducing accidents. The science of illumination engineering is, therefore, becoming of major importance.

(22) Waste Light Factor: Whenever a surface is illuminated by a number of sources of light, there is always a certain amount of waste of light on account of overlapping and falling of light outside the edges of the surface. The effect is taken into account by multiplying the theoretical value of lumens required by 1.2 for rectangular areas and 1.5 for irregular areas and objects such as statues, monuments etc.

20" IR Light Bar - Our 20" light bar is a big step up in brightness, distance, and output. With stainless steel side mounts, this light is the foundation for night hunting and navigation from your vehicle.

Best IR Illuminator for security cameras

10" IR Light Bar - The 10" light bar is our smallest size light bar, but it is still very effective. It's undergone rigorous field testing and is ready to augment your night vision.

The ratio of illumination under normal working conditions to the illumination when the things are perfectly clean is known as maintenance factor.

Actually the hot bodies emit heat as well as light energy, the velocity of these being equal to 3 x 108 m/s. The light waves have wavelengths varying from 0.00075 mm to 0.0004 mm. The wavelength of light is usually expressed in Angstrom ; 1 Angstrom being equal to 10-10 metre. The ratio of the energy emitted by the body in the form of light to the total energy emitted by the body is known as the ‘radiant efficiency‘ of the body, which depends upon the temperature. Higher the temperature of the body ; lower the wavelength of the radiant energy and higher the radiant efficiency. The radiant efficiency will be maximum when the temperature of the body will be such that the wavelength of the shortest wave radiated by the body is 0.0004 mm (4,000 Å). It is found that maximum radiant efficiency would occur at about 6,250°C and even then it would be 20%. Since this temperature is far above the highest that has yet been obtained in practice, it is obvious that the actual efficiency of all artificial light sources, i.e., those depending upon the temperature of incandescence is quite low.

Infrared LEDs and Night Vision go hand in hand. That's why we designed the most advanced ultra low light camera on the market. Combined with our Infrared Lights, Nitron XD is a Game-changer.

Ir light meaning

(19) Utilization Factor or Coefficient of Utilization: It is defined as the ratio of total lumens reaching the working plane to total lumens given out by the lamp.

If a surface of area A has an effective luminous inten­sity of I candelas in a direc­tion θ to the normal, then the luminance (brightness) of that surface is

(14) Lamp Efficiency: It is defined as the ratio of the lumi­nous flux to the power input. It is expressed in lumens per watt.

(26) Solid Angle: Plane angle is subtended at a point in a plane by two converging straight lines and its magnitude is given by