The Planted Tank Forum - View Single Post - watt/g rule: with or without reflector?
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Old 01-18-2007, 06:37 PM   #3
Are these real?
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It's a very rough "rule".

Besides reflectors, the shape, type, and efficiency of bulbs plays a major role.

A linear flourescent bulb will allow you to reflect more of its output into the tank than a U-shaped PC bulb, and that one will be way superior to spiral compact fluorescent bulbs in terms of (reduced) restrike. A fat T12 bulb will lose more light due to restrike than a slim T5, etc.
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