The Planted Tank Forum - View Single Post - Metal halide or T5 H.O?
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Old 01-22-2012, 02:49 AM   #12
samamorgan
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Energy used converted to light:

Incandescent/Halogen: 10% light
Metal Halide: 25% light
Flourescent: 70% light

There are more factors, but this is the basic concept.
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