Ceramalux® ALTO High Pressure Sodium Lamp, Non-Cycling, C250S50/ALTO NC HPS, 250 W, 100 VAC, 1.8 A, E39 Single Contact Mogul Screw Lamp Base, ED18, 28500 Lumens, 24000 hr Average Life, 21 CRI, 2100 K Color, Clear Lamp, 9-3/4 in H x 2-1/4 in D,