And hey.....anyone know if they make 150 watt red heat lamp bulbs?
Easiest place to find them is in the reptile section of a pet store, they should have them ranging from 50 to 250 watt, also ceramic heat lamps (cost more, but last much longer, and they're safer). Other places (farm stores, hardware, should be less expensive than a pet store, but will require more looking.
Keep in mind, 150 will kick out a lot of heat- I used that the last two winters to keep the water from freezing, but found it was overkill. (also, I found the bulbs burn out in six weeks, even though I had them on a timer, running them only about 5 hours a night). I switched to a 100 watt ceramic heat emitter; it screws in the same fixture. Here are specs from the packaging for that item: (remember, this is for the ceramics, I think they are more efficient than the red bulbs and probably put out more heat).
distance from bulb/temperature. These tests were done in a 74 degree room, not in a below zero coop, so your mileage will vary.
60 watt 6"/95 degrees 12"/86 degrees 18" 77 degrees
100 watt 6"/97 degrees 12" 88 degrees 18" 80 degrees
150 watt 6"/98 degrees 12" 90 degrees 18" 84 degrees
As you see, I should have just gotten the 60 watt to keep the water from freezing. A 150 watt bulb could bake your birds.