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Old 11-06-2003, 07:16 PM   #11
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Just my opinion, based on a bit of logic...

If I put a 40 watt light bulb over a 3oz shot glass that is about 54 wats per gallon but it will not grow or keep coral alive.
Wouldn't that be closer to 850 wpg?

Anyway, I disagree with that statement. If you could get a 40 watt bulb small enough to directly light a shot glass (obviously impossible, but I am following your analogy), you could grow anything that could handle that intense of lighting. I think a lot depends on depth of the coral and the bulbs distance from the water. You could have a 400 watt MH 18 inches (because of the heat) that would give less than a 250 watt MH right up near the water. Also, if you had a 250 watt MH and your coral was 4 inches from the surface it would get more light than a 400 watt MH at 18 inches below the surface.

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Old 11-06-2003, 11:30 PM   #12
Join Date: Oct 2003
Location: WI
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I guess my point was that Light output meausered by PAR and lumens dictates intensity and the ability to support photosynthesis. Not the body of water the light illuminates. Watts per gallon is useless. You could put a flashlight over a thimble of water and it still is only generating as much intensity as if it were over a 180g tank. It just looks brighter in the smaller body of water.

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light, lighting, sps

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