A dental curing light is a piece of dental equipment that is used for polymerization of light cure resin based composites. It can be used on several different dental materials that are curable by light. The light used falls under the visible blue light spectrum. This light is delivered over a range of wavelengths and varies for each type of device. There are four basic types of dental curing lights; the Tungsten halogen and light-emitting diode (LED), plasma arc curing (PAC), and laser. The two main dental curing lights are the halogen and LED.