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post #7 of (permalink) Old 12-06-2011, 06:16 AM
Hoppy
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You can use Lux meters for a reasonably accurate PAR reading: http://www.plantedtank.net/forums/li...ml#post1603516 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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