GE 20 watt - T4.5 - Bi-Pin (G8.5) Base - 3,000K - Natural White - 800 Series - Clear - Ecomagination - UV Control - ConstantColor - PulseArc - Ceramic | GE Metal Halide HID Light Bulb (Enclosed Fixtures Only) (CMH20/TC/U/830/G8.5 XM2TC8 39858)