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Re: proper lighting

O.k., I'm confused...

I'm trying to grow live plants so I want to have the
"correct" amount of light. If memory serves, the rule is 3-5
watts per gallon, right?

If this is correct, that would mean my tank ( a 42 gallon
Oceanic Systems Hex ), would need at least 126 watts !!! My
light hood has one spot for an 18" bulb and all the 18"
bulbs I've seen are 15 watts !!! How the HECK do I get that
much light ?!?!?!?!?

Please help shed some light (get it ... ??? ) on this for me.