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Fans...or electronic ballast?


I was originally thinking of using fans to cool the ballasts,
but now I'm thinking of correcting the source of the problem--
the ballasts themselves.  Through the archives, I've seen
mention of Grainger, but which of their ballasts would be 
good for 2 standard 40 watt 4' bulbs?  I have this fixture on
a thickly planted 55 gallon tank.