I used a red heat lamp this past spring. The chicks calmed down when the room lights were turned out and only the heat lamp was on. I think it is a wave length they can't see or can't see well, sort of like UV for humans. My coop is relatively close to my dusk to dawn yard light, which is a red sodium light, and they don't seem to notice it at all.
The problem with radiant heat is that it is designed to work from below, when chicks are expecting heat from above. Like someone mentioned about a radiant heater, you would have to have the tape so close overhead that it would be right on top of the chicks.
The problem with radiant heat is that it is designed to work from below, when chicks are expecting heat from above. Like someone mentioned about a radiant heater, you would have to have the tape so close overhead that it would be right on top of the chicks.