Bulb for ATLANTIC ULTRAVIOLET 05-1097, 05-1097-R, GPH436T5L, MP22, MP22A, S23 Specifications: Watts:21 Watts Length:436 mm Base:B4 Base Description:2 Pin Mini Double Ended (B4) Qtz. OD:15 mm Wiring:Preheat Output:Standard Category:Preheat Type:L Wires:0