I have a question about lamps. i have babies that are suppose to hatch mon and was wondering do they have to be under a 250 amp bulb? Also at what age can i lower the bulb to a lower watt? I have one of the big metel lamps that have clips at the top of it, can that hold smaller bumlbs? or do i need a diffrant unit each time? the chicks i have under the lamp now seem to want to stay away from the heat end all the time does that meen i need to start angeling it diffrant so not much heat goes into the box?