Well, there are 3 of them in 12 sq.ft. of brooder, and the lamp really only affects the center part, so they have lots of places to go to get in the right temp. My first brood I was able to keep that center part at what appeared to be 95F...this time that's been more of a challenge. But since I can raise and lower it as I want, and it has 2 "intensity" settings, I should be able to find one that's good enough. I have spent so much in the past 6 weeks that I really gotta make what I got work...;-]