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post #7 of (permalink) Old 12-06-2011, 05:16 AM
Planted Tank Guru
Join Date: Dec 2005
Location: Sacramento, CA
Posts: 21,015
You can use Lux meters for a reasonably accurate PAR reading: Of course this has to be used out in the air, not underwater, but it would tell you about how much PAR you will get in water too (about 10-20% more than in air).

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