Philips 368910 - MHC50/U/MP/3K ALTO 50 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 Philips ED17 bulb, 50W, Base: E26 Medium Screw, Rated Life (hours): 10000, Color Temp: 3000K, Luminous Flux (LM): 4000