Our brooder is our bath tub. I use a $10.00 IR light bulb from HD. But it uses 250w which gets expensive, gives off a lot of heat (so much that I had the bulb up 4ft and it was still too warm), and so bright the little fuzz balls couldn't sleep.
So, I took a grounded power cord from a broken appliance and wired it to a dimmer switch & a grounded receptacle, put them into a 2-gang box w/ face plate. Now I can control the bulb output with the dimmer switch as needed. It's fantastic! It uses much less power (less $ & prolonging bulb life), less heat given off reduces fire risk & less burn risk from touching it. The light is so dim that in the daytime you can hardly tell its on by looking at it and the fuzz balls can sleep all they want.
Things to keep in mind:
1. If bulb is incandescent dimmer needs to be compatable.
2. Know your limitations. Get help with the wiring if you need it.