What wattage is appropriate for an infrared heat lamp?

[Sissy]

In the brooder in the house for the new chicks
I used a 60 watt reg. blub.It did the trick but when I
put them out into the coop, we were having 11 degrees so I used a125 watt heat lamp and it worked fine, I also doubled the deep
Litter of wood shavings for warmth. and tacked a tarp up
to lower the ceiling to keep the heat lower to their roost.
and nest boxs.

 

[slickchick]

i just switched out the red heat bulb with a 75 watt. regular bulb.these chicks will be inside for awhile... that should be warm enough i think.