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I use the cider block method as well. I do not put my block in the ground though. I would worry that water would pool and cause the light fixture to short circuit. I use a 100 watt light bulb. I have never seen a 150 watt light bulb. Where did you get that from?

To keep my girls water from freezing I take a 100 watt light bulb in a cinder block. I do use a metal water can instead of plastic. Works like a charm. You do need to make sure you turn the light on long before the temp goes below freezing. The reason is it takes the light bulb a little time to...