Electrical UV Florescent Lighting (Florescent Black Lights), are a good light charging source for glow in the dark products and also work extremely well with our UV Light Sensitive Products. Products in this listing are: a) 2 Feet UV Florescent Tube powered at 20 watts. Good for booths or small rooms. b) 4 feet UV Florescent Tube powered at 40 watts. Good for rooms around 50 square feet in size. UV Florescent Tubes mentioned here, need to be fitted in a fluorescent casing. This can either be added as an option here, or purchased at an electrical lighting store near you. Electrical UV Florescent Tube casings run on either 110 or 240 volts household current.