This Eiko 00790 CAX-130V 50W 130V T8 clear bulb with a double contact candelabra bayonet base has a rated life of 50 hours. However, operating this 130V bulb in an 120V socket will result in longer bulb life (250%) and reduced light output (23%). Applications include medical, scientific, ophthalmic. Cross reference: Topcon 42426-30160, Ushio (1000123), GE (29169).