Instructables

make your own black light ideas

so in order to make a black light i (the stupid half of me) would think to dip a lightbulb in black paint. i (the smart half of me) would assume there is more to it than that here is some random 2 facts about the blacklight (wood's light) it is not black its a deep-bluish-purple what a blacklight emits is: lamp emitting electromagnetic radiation my question is how could i make one and would it be cheaper to make it or buy it...

enimey4 years ago
A black light may be formed by simply using Wood's glass instead of clear glass as the envelope for a common incandescent bulb.
An incandescent gives very very little UV
craftyv4 years ago
I found my Blacklight in a thrift shop ,The bulb is interchangeable with an ordinary one .but it is not "black" at all. so I'm sure painting it black is not the way to go. I use my blacklight for looking at my drawings in which I use Glo-pens, Fleuro ink and sparkle pens, either in all the drawing or to highlight certain lines. Most of my art is linear and geometrical or even tesselations (repeat patterns). It's amazing the difference this makes to the impact of the work. Try it you will be amazed. Don't forget to use in a darkened room. Good luck. As this is Instructables why not give it a go.
Ummm fluorescent blacklights are easy to find and cheap, you could get some replacement bulbs and just use a normal fluorescent light holder, that may save you a bit of money...
westfw6 years ago
Assuming you don't want to string together some UV LEDs, you can look for one of these Compact Fluorescent Black Light Bulbs, which are especially nice cause they'll go in any normal light socket. Especially check out party stores just after Halloween; I picked up several at 50% off. Avoid the purple-glass incandescent lights; while they're cheap, they don't emit very much UV.
Kiteman6 years ago
Plug for Phenoptix, because he supplied my UV LEDs and is sponsoring the contest.

trebuchet036 years ago
what a blacklight emits is: lamp emitting electromagnetic radiation

Just FYI: Electromagnetic radiation is also known as "light" (including non visible spectrum).

Black lights, as we know them, are "near UV" light sources (they produce "long wave" UVA's) . The reason they have that purple/blue is because of the glass (wood's glass IIRC) that blocks all light above 400nm.

The tube by itself is no different from your typical fluorescent tube except it only use one (I think sometimes two) phosphors and the glass. The ballast is identical, as is the connectors. The only difference is the bulb itself.

As for making it... Not sure how to DIY a fluorescent tube - but it seems out of reach to be cost effective. It'd be cheaper to buy ;)
ll.136 years ago
so in order to make a black light i (the stupid half of me) would think to dip a lightbulb in black paint.

Wow, that's my first thought too!
Doctor What6 years ago
Blacklights are fairly cheap. And making one, while it would be a great experiment, would probably be more than the actual cost of a blacklight, and would be a pain in the rear.