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Light Meter is a 2-in-1 light intensity (lux) and exposure meter with customizable settings. Whether you want to capture the perfect photo or optimize lighting in any space, Light Meter provides professional-quality readings right on your phone. Forget about expensive professional equipment that you have to carry around. With Light Meter, you can get light intensity data with just one click to choose the best settings for manual or film photography, adjust home, work, or greenhouse lighting, and prevent eye strain from poor lighting. Features: - intuitive and customizable controls - for front and back cam - collects light intensity data in real time - instant lux and foot candle measurements - real-time color temperature measurements - real-time histogram plotting - customizable settings for shutter speed, ISO, aperture - preview and adjust diaphragm settings before shooting Have any questions or suggestions? Write to us: sparkappsfeedback@gmail.comTerms of Use - https://www.iubenda.com/terms-and-conditions/82717056Privacy Policy - https://www.iubenda.com/privacy-policy/82717056

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The whole region with wavelengths ranging from 1 micron to 1 mm is loosely called the “infrared”, but astronomers tend to break this up into sub-regions:  the “near infrared” (from 1 to 5 microns); the “mid infrared” (5 to 30 microns), the “far infrared” (from 30 to 300 microns) and the “submillimetre” (from 300 microns to 1 mm).  The exact boundaries are somewhat arbitrary, and the exact definitions can vary.

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Great light meter and everyone out there looking for a hand out…”I suggest you do as your grand parents did and Get A Job Sir’s(or Madam’s)” This app is awesome and you cheap folks, having to pay for this app is not a problem if you care for plants and the proper amount light they receive, so they can grow up to be fine strapping plant specimens. Then again everyone that’s complaining about paying for this app(which is completely worth it) don’t even tip your servers at restaurants or bartenders after they close. To ingenious developers of this app do not worry about those cheap cable stealing complainers. As a nursery owner with several greenhouses I think this is probably one of the best light measuring devices for both indoor and outdoor besides the $109 cheap ones that won’t take a sneeze let alone outdoor use without a complete meltdown. I have not even thought of buying another “professional light meter” since I got this app. Thank you for helping my family’s garden and greenhouses.

In fact all objects glow (emit electromagnetic radiation), and they do this in the part of the electromagnetic spectrum that depends on their temperature. The diagram below shows how bright objects of different temperatures appear at difference wavelengths.

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Clearly, depending on what it is that we want to observe, we need to look in different parts of the spectrum, and no one part will tell us everything. The Earth’s atmosphere transmits well in the visible and radio regions, but it blocks out everything from gamma rays to ultraviolet and most of the infrared.  So to study the Universe at those wavelengths we need to launch space-borne observatories.

Nice, simple, straightforward app with good user interface. Good set of options make it very functional. The measurements seem reasonable and more importantly - they’re consistent. A source measured yesterday will be measured at the same value today. Also has a very nice explanation of terminology for the uninitiated. My only complaint is the overly frequent ads. Other users comment that the ads remain in the Pro version, so no reason to upgrade until this is changed. A definite 5-star app without the ad problem.

The developer, Marina Polyanskaya, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Light meterphotography

The electromagnetic spectrum spans a wide range of wavelengths from very short wavelength and highly energetic gamma rays to very long wavelength and low-energy radio waves. The visible part of the spectrum is only a small portion. Infrared light is the same as the light that we can see except that the wavelength is longer and outside the range that our eyes can sense.

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Clouds of interstellar gas and dust that form stars are typically at temperatures of about 50 K (that’s about –220oC). They glow at far infrared wavelengths and are brightest at about 100 microns (red line in the graph above).  And the universe itself is filled with radiation corresponding to a temperature of just less than 3 K – very cold indeed – with peak emission in the millimetre wavelength range (blue line in the graph above).

Maybe I’m using it wrong, or maybe I don’t understand lighting, but I really don’t think this is very accurate. I was measuring the intensity of my grow lamps since I’ve got new bulbs and a new set up, and wanted to make sure I could get as close to this old set up as possible and maybe even get some extra lumens in there. The bulbs I was comparing are 840 lum vs 1200 lum, but the readings were all over the place. When looking at the 840 bulbs, I got an average reading of 340, even when it was two and three lamps “stacked” on top of each other (which I’ve heard from other plant people increases the intensity of the lumens on the plants). I was also getting readings of over 12,000 lum on a bulb and hood combo that I know is more dim than that, seeing as my plants are typically stretching under this light (low end recc of lumens for succulents is about 2,000). The readings just feel wildly unpredictable. This is more a gripe with my phone, but also be sure to know that front and back cameras take in light differently. A spot which would read 330 lum on my front camera read as 380 with the back. Even if the numbers are wrong, the “average” and “ratio” I found at least helped me set my lamps up in a better pattern.

We humans, slightly warmer than room temperature, glow in the mid infrared and we’re brightest at about 10 microns wavelength (black line in the graph).   These days we are all familiar with infrared imaging, which allows us to see in the dark using electronic detectors that record infrared light emitted by warm objects such as people.  The pictures below show SPIRE team member Prof. Peter Ade in visible light (wavelength about 0.5 micron) and infrared light (about 10 microns).

It is interesting that the basic technique used by Herschel to discover infrared radiation is still used in modern instruments today, including instruments on board the Herschel satellite – the only real difference is a factor a billion or so in sensitivity.

Infrared radiation was discovered by William Herschel in 1800. He was studying the heating effect of different colours of light by using a prism to produce a spectrum of colours and thermometers to measure their heating effect. He noticed that the heating effect got stronger as he went from the blue end of the spectrum to the red. In a moment of inspiration, he moved the thermometer beyond the visible red end and found that the heating effect was even greater.

The Sun has a surface temperature of nearly 6000 Kelvin (where the Kelvin temperature scale is the same as the familiar Centigrade scale except that the zero degrees C is about 273 degrees Kelvin). Its radiation peaks in the visible part of the spectrum at wavelengths of about half a micron, as shown by the yellow-green line in the graph above.