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Ivyna's right, no UVB. But they are deffinitely beneficial for your tegu (or any other reptile's) well being. You can acctually use any full spectrum bulb from Home-Depot for the same purpose. It helps to have multiple lights (especially in large enclosures) to simulate natural dawn-dusk lighting. My Iguana has four seperate lights that turn on and off at four seperate times. First a regular incandescent bulb turns on, an hour or so later a mercury vapor bulb, followed shortly by a set of 10.0 UVB tubes, then at about noon or 1 full spectrum tubes pop on. they turn of in the reverse order as afternoon and dawn approach. Ever since I started this system he seems much happier and his appetite has definitely increased. Allthough this system of lighting is not "required," it just makes sense. I think it would suck if the sun popped straight up in the sky in the morning, stayed there all day, them popped straight down at night. That's what it must seem like when using a single (mercury vapor) or double (flourescent and incandescent turned on at the same time) lighting system.
Oh cool, I have a similar setup with my bearded dragon's lighting currently. First the halogen heat bulbs, then the Megaray a while later, then the fluorescent tube lights for the afternoon when it should be brightest. (Currently they're both plain full spectrum, but having one as a low-level UVB sounds like it'd be a good idea too.)
Buying all the extra timers and keeping track of them can be a bit of a pain, but it really does make a difference. I plan to do the same thing for my tegu when I get him this summer.
(Though sadly even WITH all those lights, the LUX levels still are far lower than real sunlight. This is why you still want to take your pet outside in nice weather (on a leash or otherwise safely contained) for extra benefits.)