plants dont really need uva/uvb
they need full visible light spectrum. any 6500K color temp bulb / full spectrum bulb should suffice...
You can use the domes though I prefer the simple light fixtures or a T8 fixture personally. If you are using CFL's I would personally suggest:
http://www.herpsupplies.com/product.cfm?groupid=1159&id=PT2225 over domes. The domes are meant to focus the heat as well, and although its minimal with CFLs, I still prefer not to.
Otherwise, a $20ish dollar T8 fixture from homedepot/walmart will work. Get a 6500K "Daylight" bulb (thats the more important part)...HD only carries 4' daylights around here...i have to go to a lighting supplier to find shorter ones usually (you can use lower color temps, but 6500K will lead to the most colorful flowers/etc generally)
How do you know its your lights for sure?
MOST LIKELY ISSUES:
-Not enough light
-TOO HOT / plants too close to light (look for individual leaf burn to indicate this)
-Plants are planted in potting soil/poor drainage soil and are dieing due to rot from overwatering (the solution is NOT to water less, but to change your substrate to a better draining one)