Ceramalux HID Lamp, HPS 250W E39 ED18 U ALTO, 250 W, 95 V, 3 A, High Pressure Sodium Lamp, Single Contact Mogul E39 Lamp Base, ED18, 24300 lm, 24000 hr Average Life, 26 CRI, 2100 K Color, Clear, 57.2 mm Dia x 248 mm L, 114 lm/W Efficacy, 400 deg C Bulb, 210 deg C Cap-Base, Standards/Approvals: ANSI S50 Specified, Applications: For general and street lighting