The place where I work has a silk screening shop and I use there UV exposure table. The table may not be an option for you, but I will tell you that it is nice and I have gotten spoiled by having a UV table with a timer and running water in a dark room (there safe lights are yellow). Before I got up the nerve to ask the silk screen guy to use the table I was using the Sun, it was cheep and available, but exposures took longer, wind was a problem, and believe it or not the sun is not the most reliable UV source.
I looked at tanning lamps before I gained access to the table, and they looked either too expensive new, or too dangerous from an electrical standpoint used. I did give some thought to using a halogen work light but wasn't sure of the UV output, and in a fit of insanity I thought about getting a bunch of stuff ready to print and going to a tanning salon and using a tanning bed, that would have been funny.
One thing I notice with the UV table is that when I put my sandwich of paper and negatives in and apply the vacuum the whole thing looks like a mess of newton rings but the prints come out great with no signs of newton rings transferring onto them.
If your working why not see if your employer or a sub contractor of yours has a UV table you can use. Another thing you can do is see if there is a local shop that does silk screening and will do your exposures for you, or with you assisting. Some of the people that do this type of work are graphics geeks and might let you do it just so that they can see how the process is done and what the results look like.
