I have always heard 3-5 watts but I go with 10 if I can to be safe. I am goin to have 2 250w ebo jager on my 55, 77 and 20 combo, I am also puting a 100w in the 20 because it will be the farthist away. With the MH and PC lighting that should be lots of heat to keep things nice and warm in the house and tanks, mabe even help to save some gas.
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