Personally, I use MVBs as well. The tubes just don't put out enough usable UVB for a desert basking species IMO. I use Mega Rays on almost all my cages.

The "IMO" part is important. Unfortunately there aren't any definitive answers. There are some pretty good guidelines, though. For the best information about reptile lighting, visit The UV Guide UK. It's an incredible website with tons of info, including independent testing of various brands and styles of lamps and links to various other resources.

Another really good place to ask questions like these is the UVB Meter Owners' group on Yahooo. You don't need to own a meter to join it (though it's an incredibly useful tool that I'd highly recommend). I learned a lot from them.
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Torey
Eugene, Oregon, USA
1.1.5 Saharan Uros (Joe, Arthur, Waddles, Stilts, Hitch, Lefty, and Skywalker)
3.0 Mali Uros (Spike, Turtle, and Tank)
1.1 Ornate Uros (Scuttlebutt and Shazzbot)
1.3 Collared Lizards (Ripcord, Thiamine, Riboflavin, and Niacin)
2.0 Green Anoles (Bowser and Sprocket)
1.1 Chubby Housecats (Roscolux and Jenny)

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