The incandecent bulbs are terrible. The spotlight shaped ones, are just that... Spotlight "shaped". No reflective material in the bulb to focus the light into one directional beam. Their cheap cheap CHEAP! (which translates into sux, sux, SUX!)
The most economical bang for your buck is any flourecent tube you can afford.
For small areas or to focus the effect, use the compact flourecents. Put then in a clamp lamp, (the metal kind with a SMALL shiny silver bowl?) and the effect will be focused in one direction and adjustable.
For a room, like a hallway or a bathroom, I'd use the 18 inch long stereotypical fixtures.
For larger areas, go with the 4-foot flourecent shop lights and install a flourecent blacklight tube(s) in them.
Don't forget...
Blacklights can damage your vision if you don't protect yourself. Imagine if you brought a white flourecent tube up to your eyes and switched it on, and staired into it for hours. Not a bright idea. (pun intended.)
Blacklights are the equivalant output to the white version. It's just that our sensory perception (eyes dialating, or "pain",) isn't triggered as well with the UV spectrum.
Just because it ain't bright, don't mean it's not doing you any damage. The best sunglasses have ORANGE or AMBER lenses.
Buy a pair of UV blocking sunglasses if you plan to be in a strong UV environment. You won't chance your vision with retena burns or cause an increase in Cataracts, (a clouding of the lens within the eye,) as UV tends to age the lens faster.
It may also prevent the lens's ability to focus. (but this is over a prolonged use over years.) But, hey... you wouldn't operate shop machinery without eye protection, why take a chance in this case??
THESE days, UV blocking sunglasses enjoy a standardized rating system. If they say they block 90%, then that's what they block. But the best test is to look through a pair, at a UV lamp which is on. If it looks like the lamp is dim, or completely out when you wear them, then that's a good pair.