I've bought from Costco CFL bulbs screw type base 18W, 6500K, the output is around 65 lumen/W.It is not specified if they are full spectrum or not. I'm planning to use these bulbs in an old light fixture for 10gal tank(previously had incandescent lights). My question is if anybody tried to use these bulbs and if you are satisfied with them. Any pro or contra opinion will be greatly appreciated. Thank you, Daniel _______________________________________________ GSAS-Member mailing list GSAS-Member@thekrib.com http://lists.thekrib.com/mailman/listinfo/gsas-member