The Planted Tank Forum - View Single Post - Help Please!!!
Thread: Help Please!!!
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post #4 of (permalink) Old 10-31-2012, 05:26 PM
Planted Tank Guru
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Join Date: Dec 2005
Location: Sacramento, CA
Posts: 19,671
It is hard to estimate how much PAR you get with two or three lights that are identical unless they are placed very close together. When you use a mix of different types of lights with unknown spacing it is pure guesswork as to how much PAR you will get.

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