GE 18679 - MXR100/C/U/MED 100 watt Metal Halide Light Bulb HID Bulbs produce high output for their size making them a compact powerful &amp; efficient light source HID Bulbs are used for general lighting, professional lighting fixtures, growing applications HID bulbs put out around 3-5 times greater output (lumens per watt) than traditional halogen bulbs GE BD17 bulb, 100W, Base: E26 Medium Screw, Rated Life (hours): 15000, Color Temp: 3200K, Luminous Flux (LM): 8500