My flourscent light on my 10 gallon finally died last night after 7 faithful years of use...its something with the ballast, i tried a new bulb in it and it still wont start up. But i have an old incandecent hood laying around and i saw some screw in flourescents at walmart last night and wondered if they would work?? If they do they would provide more than the 15 watts that i had and would be less of a hassle than trying to locate parts for my flourescent hood. Anyone use the screw in flourescents and if so, what kind and are you happy with them??