Lamp 1 : A complete light source unit, usually consisting of a light generating element (arc tube or filament), support hardware, enclosing envelope and base
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}