After *WASTING* money every 3 months on a new $35 uva and a new $35 uvb bulb for over a year, I finally caved and bought a Mercury Vapor Bulb at PetCo.
Oh. My. Stars. SOOOO HAPPY! My turtle basks more often than ever before and NEVER gets photokeratoconjuntivitis. EVER. The MVB supplies EVERYTHING an RES needs: light, heat, UVA, and UVB. Before I got this, I had like three of those stupid clamp lamps on top of the tank, and it was an absolute electrical circus. Now everything looks streamlined and pretty... and the MVB bulb, in my opinion, has improved his health significantly. He is much more energetic and has a bigger appetite.
You can order them online for $30-40 cheaper than PetCo/Petsmart at Drs. Foster and Smith:
http://www.drsfostersmith.com/product/p ... atid=21330
Seriously, don't even waste your time and money on the other bulbs. It's absolutely stupid and you're not saving yourself any money because you have to spend $30 on a heat lamp, $30 on a UVA, and $30 on a UVB. STUPID! Plus, the regular UVA/UVB lamps will give your turtle photokeratoconjuntivitis if they aren't positioned 12'' away, and when they are that far away, they don't help with increasing the heat levels on the basking area.
Also check out their AMAYYYYZZZINNNGGG basking ramp for $30:
http://www.drsfostersmith.com/product/p ... catid=8809
I absolutely love this product. The large fits perfectly inside a rectangular 30 gallon tank and will, of course, work with all larger tanks. My turtle loves it because it's really easy for him to climb up and he has lots of space to move around on.

