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Old 06-16-2003, 02:03 AM   #1
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confusion over Compact Flo's

When measuring Watt per gallon.. what do we look at. For instance I have two 20W compact flo's that equal 75 Watt incandecent... how many Watta per gallon am I giving my 10 gallon tank??? thanks all
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Old 06-16-2003, 09:13 AM   #2
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40 watts. The comparison to incandescents basically means that the bulb will appear to put out as much light as a 75w incandescent. For our uses, you need to go with the actual wattage of the bulb. While wpg is probably OK for a 10g, when you get into larger and deeper tanks, it's not really a good equation to use. One other problem with the screw in PC's is that a lot of the light is reflected back into the bulb. This shouldn't pose a problem in your tank, but again, it's something to think about when setting up a larger tank. I would think that 40 watts would be plenty of light for a 10g with plants...but then I'm not the plant guy here.
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Old 06-16-2003, 11:06 AM   #3
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Oh okay good, I was scared for a minute there that I was only gicing the tank about 2 Watts per gallon, which would stink
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Old 06-16-2003, 02:56 PM   #4
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one thing that makes the watts per gal calculation also a problem is that a watt is a measure of energy consumption. So a 40W florecent will use 40 watts of electricty. a 75W florecent will use 75 watts of electricty.

IF one is a PC bulb and one is standard florecent they might output simular intensity of light but 1 would consume almost twice the energy.

I belive most people who work with lighting as part of their job measure the light produced by a type of bulb in LUX vs watts.
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