From our friends at instructables comes an easy project for use with UV LEDS.

To make this simple project, here’s what you’ll need:
2 Ultra Violet LEDS
1 1/4W resistors (the value of the resistor needs to be calculated based on the forward voltage of the LED you use)
1 non-working 9V battery (or a 9V battery clip)
1 new 9V battery
Pliers
Solder
Soldering equipment

The full instructions on the Instructables site will show you how to put everything together. Once assembled, the light snaps on to a working 9V battery to function.

Keep in mind, you don’t have to use UV LEDS for this project – you can use any color. Just adjust the resistor required based on the forward voltage and forward current of the LEDS you choose.

Buying LEDS without specs or you don’t remember the specs of the ones you have sitting around? Assume a max of 2.8V – 3V and 20mA. I would think high intensity white LEDS would work really well for this project.

I haven’t put this one together myself yet, but I think a few of these are coming with me on my next camping trip. Nice way to light up the tent and the ‘facilities’ late at night. Fun project – and you probably already have everything you need right on hand.