Blacklight?

Question:i am thinking about buying some blacklight posers(3d posters when using a blacklight) and i wanted to know if you can just buy 1 blacklight to light up ur room,or more than one for every poster.I dont know if you need the blacklight right near the poster or can it still work from a little distance.please help.

i really need to know.thanks sooo much.

Answers:
Hi, I still have my black lights.The light bulbs are from 1970. They work better than any of the new ones do. They really look quite different. But yes ,they are sold as eaches. You can buy as many as you need,but one or two is good for a whole room. I love em. Bye