I would not want to hijack this thread in my favor but I am curious about one thing. I was planning to build a light source for alternative processes, but I just happen to have a metal halide with the casing sitting around.
The bulb and the ballast is 150watts. It is a philips MHN-TD, the bulb has a quartz casing. I checked the spectrum it shows it produces some UV in usable range. Do you think that is feasible to use after removing the glass from the casing or should I not bother myself and go build a device.