The Planted Tank Forum - View Single Post - DIY PAR meter, Yeah you heard me
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post #20 of (permalink) Old 11-10-2010, 05:28 PM
Planted Tank Guru
Join Date: Dec 2005
Location: Sacramento, CA
Posts: 21,015
I think PAR in full sun at midday is around 2000. That suggests your readings may be about half of the true PAR values.

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