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This article is from the ReefKeepers FAQ, by several authors (see the Credits section).

3.1 Lights: General Discussion

A rough "rule of thumb" is 4 Watts/gallon with successful tanks
using from 1.5 - 6 Watts/gallon.

1) Fluorescent fine (some prefer) for shallow (<20") tanks. Use
mix of bulbs (50-50, 03s, etc.)

2) Metal Halide (MH) required for deeper tanks.

3) Mercury Vapor, Halogen, HPS, etc. - avoid, wrong spectral
output.

 

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