the two 15w fl tubes i got dish out 610 lumens.. 1220 lumens right there, the two full spectrum 25w bulbs I got dish out 1750 lumens.. Thats a total of 4720 lumens given off in my bin at a total of 80w, for 4 plants.. however I also hear that reading the lumens given off by a cfl is invalid and inaccurate info.. wats the deal with it?? I'm lookin into buyin a few HID MHs... I wanna sspeed up the growth and make sure i get some good stuff.. ideas? questions? comments?