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thanks- but why do people say PC are better than tube lights if the same energy used (20 watts) equals the same output?? I thought 20 watt PC is equivilant to 100 watts regular, at least thats what it says on the box.. can you help me with this??

I'm really confused. I don't understand when people say they need or have a certain amount of wattage- is this the actual energy used by the PC or the equvilant light emitted. For example, I have a 10 gallon with srooms, leathers, zoas, etc (but we would like to keep LPS) lighted by one coralife...