don't know if its been mentioned yet, but a 75 or 85 watt red flood light bulb works good too. had a few left from christmas outside decorations.
I originally bought a 250watt red heat lamp bulb. then had to put it a mile away from the brooder. it did heat the whole spare bedroom tho! (I did eventually make use of it when I moved chicks outside.) i used the flood light inside, even used a green one when my spare red went out - better than white still, and experimented with lower wattage bulbs too. they are harder to find in anything but white. I did find a yellow tint bulb that was insect avoider, and a pinkish bulb too. I used these in the daytime and my red bulbs at nite. I also made another reflector outa a aluminum bake pan.
the aquarium brooder ended up with two candelabra type (orange color) bulbs at 25 watt each (total of 50w) with room to get away if too warm. watch your chicks behavior - you'll know. thats the enjoyment anyway, watching them.