Re: Questions about AP cages.
A puck light is a light that is roughly the same size and shape as a hockey puck. They make them for "under cabinet" applications. But they happen to be low wattage xenon/halogen bulbs that put out a good combination of heat and light, can be run on a rheostat or proportional thermostat, and don't come with the burn risks associated with trying to install an in-cage heat light or ceramic heat emitter.
A cfl is a compact fluorescent, just your regular spiral fluorescent bulb. Just provides light with very little heat output.
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