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  #1  
Old 09-04-2013, 02:25 AM
withoutid withoutid is offline
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Measuring light intensity with a smart phone
Default Measuring light intensity with a smart phone

Hi everyone,
I am new member to the forum (but not that new to orchid ). I just figured out that there are 2 apps for android phone that can measure the light intensity: beeCam lightmeter and Light meter. Has anyone tried to compare the accuracy of these apps to a professional light meter? Using the galaxy S4 with these apps, I came up with some number:
Outdoor, under direct sunlight: 58~60k lux
Indoor, through a black window glass: 20~24k lux
Indoor, toward the sky, no sunlight: ~2k lux
It would be wonderful if our smartphones can give us number close to that from a professional device, that's why I 'd like to ask. Thanks
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Old 09-04-2013, 10:38 AM
Paul Mc Paul Mc is offline
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I believe there was a discussion here about this. Hmmmm, let me see if I can find it to post a link.


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  #3  
Old 09-04-2013, 10:41 AM
Paul Mc Paul Mc is offline
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Here it is!

http://www.orchidboard.com/community...ad.php?t=41106


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Old 09-04-2013, 01:16 PM
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RosieC RosieC is offline
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I tried the free versions of both those apps and couldn't figure out how to get them to do anything, let alone how to interpret the results. So I gave up.

Let us know if you have any luck.
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Old 09-04-2013, 01:39 PM
jeremyinsf jeremyinsf is offline
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There are actually several threads on this board that cover this topic, that talk about the different apps, how to use them, how to interpret the results, people's opinions about them, etc.

Search for "light meter" or "light meter app".
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Old 09-04-2013, 05:28 PM
Island Girl Island Girl is offline
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When I used my app, I had to take the numbers the app gave me (when I held it up to a sheet of white paper) & enter them into Rays light intensity calculator, then that would give me the reading in foot candles: Light Intensity Measurement

....eventually, I just got a decent light meter (think I ordered it from Ray, actually) because I hate math, and I'm HORRIBLE at it! (even with a calculator, lol)
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Old 09-05-2013, 03:07 AM
naoki naoki is offline
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Those phone camera light meter is a reflected light meter, right? In other words, color of the area which is reflecting the light influence the measurement. So if you use the neutral gray card (18% gray, available at photography store), the reading should match with the incident-light meter.
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