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I have played around with the idea of using the glass pickle jar someone on here suggested, for years. Only that even if you take led lights which generate much less heat than compact florescent, even they generate an amount of heat. They use heatsinks to draw the heat away, so whatever bulb you use, whatever material - plastic or glass - it needs to have a way to dissipate the heat out of the enclosure. Some of those led bulbs catch on fire.