The Planted Tank Forum - View Single Post - Lighting an Aquarium with PAR instead of Watts
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post #116 of (permalink) Old 01-25-2013, 01:36 PM
Algae Grower
raulfd4's Avatar
Join Date: Dec 2012
Location: Southern Maryland
Posts: 115

Two questions:

According to the PAR vs Distance for Various T5 Light Fixtures chart on the first page, the AquaticLife T5HO 36" 4 bulb fixture has about 90 PAR at 25 inches.

Is it safe to assume that the same fixture with 2 bulbs has about 45 PAR at 25 inches?

I have glass covers on top of my tank and they build up quite a bit of condensation.

How much will the glass/condensation on the covers reduce the PAR of a light?
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