Really Irrelevant Ramblings

Depending on the mythology you subscribe to, vampires either burst into flames or sparkle in the sunlight. How does that apply to tanning beds? The books all talk about how white vamps are because they can't go in the sun without risking death (I'm going to discount Stephanie Meyers because although I REALLY liked the Twilight series, it is totally different from all the other vamp mythology out there). But, in theory, couldn't they use a tanning bed? What is it specifically about the sun that is toxic to vamps? Is that same thing found in tanning beds?

See? Irrelevant but I bet you are wondering about it now too