You should reconsider how you're attaching it - the clamp is the highest point of failure in these things. Every heat lamp should be securely hung by the hanging loop (and in many cases folks also hang the cord as a just-in-case), with the clamp providing support.I use a reptile heat lamp attached to the side of a plastic tote. The chicks started jumping out so now it is attached to a wooden chair beside the brooder with a metal grate underneath. This is the best picture I have. Underneath the towel is a metal guinea pig cage cover. I have raised 3 batches of chicks and have never had any problems. I know it is not the safest but the brooder plates aee so darn expensive.
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When they are little it is clipped on the tote.
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The wood chair, towel and plastic tote are all burn hazards with the temperatures these things can run at.