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The chicks can tell you in their own way. If every time you walk in the area they are as far from the bulb as they can be you have your answer. I used A dog crate and just lined the bottom to keep debris in.

Make sure they can move away or close as they deem fit to stay warm. I would hope this is obvious but remove anything that can burn away from the bulb, make sure the light is anchored and cannot move, and make sure the chicks cant break the bulb.