Wait a minute!
Light intensity is not measured in watts! That's the whole point of
Tim's question. Leave "watts per gallon" as a heater spec. Light
intensity is measured in lumens, or foot candles, or candellas etc...

Tim,
Sorry I don't have a direct answer to your question but it is a good
question. (worthy of a good answer) I think you may have to contact
the lamp manufacturer to find out what the actual light output for
each lamp is. The wattage spec is the amount of electricity it uses,
not necessarily how much light it produces.

On Thu, 22 Sep 2005 23:47:12 GMT, Wayne Sallee
wrote:

Don't worry so much about those numbers, but look at the
actual spectrum. Figure wats of light per gallon. You want
3 to 5 wats per gallon. 3 being low, 5 being where you
want to be for stonys,and even higher like 6.6 is good.
And metal halide is the best light.

Wayne Sallee
Wayne's Pets



Timcat wrote:
I have a puzzling question. In researching lights to set up a new tank, I
can't find anything relating Fluorescent tube wattage and MH wattage to
lumens, or a comparison to incandescent...like you always see on CF tubes
for home lighting, i.e. 20W CF equals a 100W incandescent bulb. I'm
wondering if, for example, 500W of CF lighting has the same output as 500W
of MH. Am I making this clear? Am I talking apples and oranges here, or am I
missing something?

Tim