This is only about 1/4 to 1/3 of the brooder. They weren't going to the "dark side" (other side of fhe waterer) so they must have been in the just-right zone. 
Seriously, I do believe they are happy with the heat. They are not huddled together trying to keep warm; they are moving about, eating and drinking. I've even seen a lot of them stretching and soaking in the warmth (until someone has to go and walk on them
). I do know that I will move the light higher as they get older and the water and food farther from the heat as well. This first week or two things stay close until they get better at walking.

Seriously, I do believe they are happy with the heat. They are not huddled together trying to keep warm; they are moving about, eating and drinking. I've even seen a lot of them stretching and soaking in the warmth (until someone has to go and walk on them
