From the ManufacturerGE 26424 150-Watt LUCALOX HID High Pressure Sodium MED BASE. Bulb Diameter (DIA) [Nom]: 2.125 in, Bulb Finish: Clear, Bulb Material: Hard glass, Burn Position: Universal burning position, Color Rendering Index (CRI): 22, Color Temperature: 2,000 K, Effective Arc Length...