GE Ecolux® Lucalox® High Pressure Sodium Lamp, High Intensity Discharge, LU150/55/H/ECO Designation, 150 W Wattage, 110 VAC, High Pressure Sodium Lamp, E39 Mogul Screw Lamp Base, ED23.5 Shape, 16000 Lumens, 24000 hr Average Life, 22 CRI, 2000 K Color Temperature, Clear Lamp, S55 Ballast, Enclosed/Open Fixture, 2.95 in Dia x 7.75 in L Dimensions