I use a 400w metal halide floodlight. (as would be used in a gymnasium or warehouse). It was a freebie from an electrician friend. They regularly sell for less than shipping cost if you bought one used online.
Having a non-sun source is good for evening work of course, and for repeatability.
You should be able to get blacklight bulbs from lowes/home depot as well for your contact printing light if you want to go that route.