That site was new to me, thanks. 2G11 base is 4 pins in a row, which is what I have. The bulb you mentioned as a CRI of 82. The 5500K bulb at AHsupply has a CRI of 91. I wonder how much of a difference that makes in the appearance of the tank? Well, probably not $7x4 worth anyway. Although I don't recommend it to anyone else (because it takes some > re-wiring, creating possible fire/shock/death hazzards), an $8 shoplight > ballast from home-depot can overdrive one of these bulbs (to about 60 > watts)and light it up like the sun. (and I mean *bright*, which is kind of > fun for a $20 light). That actually sounds like my kind of project, but for another day. On a side-note, I picked up one of Susan's super-lights, which is also > bigger than my tank. No chance of "seasonal depression" here...opening > the door to my fish room is like having a religious experience... If I had a fish room I'd do the same. Unfortunately my main tank at home is in the same room as the couch/TV and that much light would probably be really irritating. - MS _______________________________________________ GSAS-Member mailing list GSAS-Member@thekrib.com http://lists.thekrib.com/mailman/listinfo/gsas-member