The light is just awesome. I am using three AAA 1.2V rechargable ni-mh batteries and it works great. The only bad thing is 2 of the UV lights have died the second day. It must have been my bad luck. But for this price is a great product. In my next order i will buy UV led emiters (http://www.miniinthebox.com/5mm-uv-led-emitters-20-pack_p224215.html). And replace the LED-es. I rate the product 5/5.