The Planted Tank Forum - View Single Post - Metal halide or T5 H.O?
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post #15 of (permalink) Old 03-10-2012, 02:42 AM
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Join Date: Aug 2008
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Originally Posted by samamorgan View Post
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.

This is incorrect.

Originally Posted by samamorgan View Post
Yeah, most of the energy that is not converted into light is converted into heat instead, so for that metal halide, 75% of the energy used is converted into radiation. This leads to more expensive cooling bills as well. Yet another thing to factor

Imagine a 150w incandescent

All of the energy, whether or not it is converted to light, will end up as heat. Flourescents and halides watt for watt will put out the same heat.

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