Uromastyx Advice

Hi y’all! I’m looking for advice we are looking to add an ornate Uromastyx to our collection! We are getting a 4x2x2 pvc enclosure, I’ve been doing tons of research but I can’t find a definitive answer what percent of uvb should I use, also what brand it the best and should it be bar style uvb or bulb? The uvb will be mounted inside the enclosure on the ceiling if that helps at all. Any advice or tips help!