Blacklight is one of the most popular types of lights used. The use of black light ranges from nightclubs and bars to top secret governmental facilities. The name blacklight is another term for an ultraviolet (UV) light. Ultraviolet light is invisible to the human eye but when ultraviolet light hits a fluorescent object it emits a visible light. A fluorescent black light in a room will make anything that is fluorescent or white have a glowing effect. Blacklight bulbs can be used with phosphorescent or fluorescent materials to re-radiate light waves to make visible light for the human eye. Black lights are used for deco rational reasons as well as advertising. Portable black lights are used by inspection departments for quality control and are also used by the military and used to help find raw materials.

The major sources of black light come from the fluorescent black light lamps and mercury arc lamps. These lamps can be found almost anywhere and with their vast array of uses, it is no wonder their popularity level is through the roof. The most effective way of dispensing black light is the fluorescent black light tubular bulb. New products are being produced with the ultraviolet technology. Through new developments now available is the black light pen. With a black light pen you are able to write invisible messages. These pens are used by many law enforcement and other governmental officials. The invisible messages can be reviled when hit by the ultraviolet blacklight. These pens are great for hiding secret messages and are also a great gift for both children and adults.