Actually, light bulbs are good for basking, raising the temperature in one spot, but the air temperature still has to be reasonable. If it feel chilly to you, then it's too cold for them; they're ectotherm, remember? That's why opened top cage is no good for keeping reptiles because it allows heat to escape. However, you can't keep a large monitor in a small enclosed cage. You probably need a well heated, room size cage for a large size animals. This is why I don't recommend to newcomer to get monitor like the ASian monitors.

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