I got it from my LFS Creature Comforts. It is a 6 LED Marineland Bubble wand, it comes with the adapter and its a 2 piece unit (light plus a little cord with a connector, adapter with some cord and a connector. Cost me $20.
Here's one :
http://cgi.ebay.com/ws/eBayISAPI.dll?Vi ... 602_263622
You can hook an air pump to it if you want, but I wanted my LED lights pointing down so the pump doesn't bubble downwards. I totally recommend getting one of these in red. The light is bright enough you can observe the fish, I do this while i fall asleep. But it is not bright enough to reflect off the water/tank and light up my walls or room to the point where its uncomfortable to sleep, it's kind of like just my fish tank is illuminated. Watching the fish at night in the red dim light is different than just watching them swim, it almost seems like they don't know they are being watched. I took the blue moonlight out and put it in my 29gal tank pointing down on a little pile of live rock with blue xenia and it looks cool.
But anyway get one of these wands! It can go underwater (what its meant for to bubble upward). Its safe and it looks cool. It comes in red, green, blue and white was all I saw, but the red is awesome.