Does UV exposure cause deterioration to PVC pipe which can lead to catastrophic failure?
I work in an environment that has 384 54W T8 fluorescent lamps and one PVC pipe. The pipe was unwrapped and began failing (crumbling apart) in 9 years. It wouldn't have held up to a someone bumping into it for probably a year prior to that, either. Your conditions will probably be less extreme, but it's a good idea to wrap or paint your pipe.