Signify Luminaires Ceramalux HID Lamp, C100S54/M PH 12PK Designation, 100 W Wattage, 45 to 62 V, 2.1 A, E26 Lamp Base, 9200 Lumens, 24000 hr Average Life, 18 CRI, 2100 K Color Temperature, Clear Lamp, ANSI S54 Ballast, Universal Fixture, 55 mm Dia x 138 mm L Dimensions