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I agree with the other posters about the heat lamp, warnings and recommendations. You could check out the alternatives to a heat lamp if you have the funds. Some are 1) brooder heat plate (I use this), 2) momma hen heating pad, or maybe 3) infrared ceramic bulbs that are used in reptile habitats.
I've also seen people in very mild climates/sheltered brooder or when chicks are almost all feathered out - use a small cardboard box and the chicks will huddle under that and be warmer together even with no electricity.