The Planted Tank Forum - View Single Post - Window screen light filter
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post #20 of (permalink) Old 12-06-2012, 05:20 AM Thread Starter
Planted Tank Guru
Join Date: Dec 2005
Location: Sacramento, CA
Posts: 21,015
It looks like you are getting a diffraction effect that makes those bars of light show up. I haven't tried the screen with a LED light, so it may not work the same way. All I know is how it works with fluorescent lights. But, when you start shining light from near point sources through any form of "grating" you can get unexpected results (unexpected only to a non-physicist).

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