Re: Problem
To be UV transparent, the "light bulb" would have to be made of quartz. Any superheated gas would be so hot and highly pressurized that the brittle quartz bottle would fracture, leaking hazardous radioactive emissions.
Perhaps radiation could pass through the quartz and be absorbed on the other side by a coolant (propellant), but then the propellant would heat up and transfer heat to the quartz by convection.