Blue light in flowering shouldn't really matter, the plant will still synthesize it's radiation output and possibly aid some in the development of the buds and the overall health of the plant.

As for the UV bulbs, you want UV-B bulbs. They're fluorescent lights designed to produce more UV-B radiation than a standard light, even for growing. They're intended for pets -- reptiles -- and such. In a study [http://www.hempfood.com/IHA/iha01201.html], cannabis was subjected to high amounts of UV-B radiation. The study concluded that under high levels of UV-B radiation cannabis produced greater quantities of THC. You can get the bulbs in tube or CFL [medium] at most pet stores -- look for the ones that have an output range of 10.0 UV-B.