On this note, though others posted some interesting stuff, speaking from experience in Brooding.When brooding in a cold place, two bulbs are a must, in my book, for peace of mind.
I'd rather have two 125 watt fixtures running than just one 250 watt for this very reason. They may complain a bit if a 125 burns out, but the other 125 will keep them going until I arrive.
Same principle as in the homemade incubators that use light bulbs. Build it with two fixtures and divide the wattage needed to provide the proper heat. If one burns out, the other bulb will keep them warm enough until you discover the loss of one bulb.
I've had those 250 red bulbs burn out, go out, whatever and lose chicks. It's heart breaking. I now use two lights. They do sell 175 red heat bulbs on line. IMO, 250 watt bulbs are very hot and only good if you brood in a cold place. In my office they raise the temp considerably.
In the right place, a white 100,75 or even a 60 incandescent bulb will work, but keep the chicks up making it hard for them to sleep and being babies they need their sleep.
( Now IF there is a power outage, I've suggested using some sort of jug, milk/bleach etc. etc filled with hot water. It should keep them warm enough until the power comes back on. Provided of course you have a source of hot water. )
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