Yes Matt, I have and do use LED. lamps.
I only use the ones that have a plastic shell and 24-48 white T5 lamps in them, they produce nearly no heat.
Also if you purchase the 12 volt ones commonly sold all over ebay and China distributors, I use a 12 volt pack transformer like an answering machine comes with, or like sold at radio shack, or even electronics at wal mart, then you can mount the socket openly inside the cage, if the snake wraps around it, no big deal, it cannot burn the snake, low voltage cannot shock the snake, so even if the fool climbs right out of the water bowl wet and goes immediately to the light, no harm done.
like this place where I get mine.
12V DC LED Lights
Don't go by their catalogue prices either.. They operate under a dozen names on ebay and oddly compete with themselves, several "buy it now sites" with various prices, all leading to the same POS warehouse.
look at some of the cool offers on the cheap..
12 volt e27 | eBay