High Intensity Discharge (HID) Lamp : An electric discharge lamp in which the light producing arc is stabilized. Examples of HID lamps include High (and Low) Pressure Sodium, Metal Halide and Mercury Vapor
Young & Company Electric Power Products and Related Engineering Services, Glossary of Electrical Terms, http://www.youngco.com/young2.asp?ID=4&Type=3, CA., USA 2001. (Electr Sfty - Amer) {514}