Powersuns have iffy lifespans. For good UV and pretty good longevity, you can try the MegaRay MVB at reptileuv.com. It has an excellent reputation.
When I switched from fluorescents to MV, my uros brightened up considerably. I doubt it changes their potential for color, but it brings out their best. Of course, so does natural sunlight, if you live somewhere warm enough to get them outside. 

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Torey
Salem, Oregon, USA
1.1 Uromastyx Geyri (Joe and Arthur)
2.0.1 Uromastyx Dispar Maliensis (Tank, Turtle, and new neighbor Spike)
1.1 Anolis Carolinensis (Bowser and Leeloo)
1.1.1 African Dwarf Frogs (Bruce and Sheila)
1.0 Betta Splendens (Mr. Miagi)
1.1 Felis Domesticus (Roscolux and Jenny)
