High Intensity Discharge (HID) Lamp, High Pressure Sodium, 100 Watts, B17 Lamp Shape, ANSI Number S54, Lamp Designation LU100/MED/ECO, U Operating Position, Universal Mounting Position, Description/Special Features Clear, Average Life 24K hr., Max. Overall Length 5-1/2 In., 9500 Initial Lumens, 2000 Color Temp., 22 CRI, Medium Base, Open Fixture Type, 9500 Mean Lumens, Light Center Length 3-7/16 In., Standards Meets 2012 Lighting Legislation Energy Standards