I agree with Corey ...
as previously stated, UV light isn't needed by nocturnal snakes. As a rule, I don't use any supplemental light for any of my elaphe spp. (corn snakes and rat snakes). They all do excellently without it. The critical factor for these animals is ambient temperature of the enclosure, with a warm spot accessible.
Turtles and tortoises are another story completely. My RES turtle, when living indoors, has a full-spectrum flourescent light above her haul-out rock. During the warm months, she's outdoors almost constantly, with constant access to both shade and sunlight, at her option.
"Nothing is so firmly believed as that which we do not know."
<i>H. L. Mencken</i>