You know what? Forget UV tanning lamps, I've found a much better (as in higher quality) alternative.
The IMAX projector box.
They use water cooled Xenon lamps, inside a perfectly fabricated parabolic chamber. The best for this application as the lighting system has already been through extensive testing. All that's required is to replace the projection lense with a larger convex, then a smaller concave to extend the focal point.
The xenon bulbs are VERY powerful, I'm estimating that they are just powerful enough to work with harder metals like copper and brass powder. Possibly even steel alloys.. but that could be just beyond the threshold.
Their about $700 per lamp at the time of this writing, which is expensive.. but try buying an equally powerful Co2 laser for that price would ya?
Now.. I just need to find a place to buy Imax parabolas... and their equiv. xenon lamps...