Voltage 6, Wattage 27, Amps 4.5, Base E14 W/ RING 44MM, Shape S11, Overall Length (mm) 64, Filament C-6, Mfgr: Heig Streit, 6V-4.5A 9-HOLE RING BASE American Optical - 12521/12522/12533 - HS366 Replacement Light Bulb - Equipment to Lamp - Haag Streit, 6V-4.5A 9-HOLE RING BASE