Philips 41319-5 - 145 Watt - Replaces 175 Watt - ED28 - Coated - CDM AllStart - Metal Halide - Protected Arc Tube - 3900K - Mogul Base (EX39) ANSI C192/O - Universal Burn - CDM145/C/U/O/4K/ED28/EA/AllStart 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 Panasonic ED28 bulb, 145W, Base: E39 Mogul Screw, Rated Life (hours): 20000, Color Temp: 4000K, Luminous Flux (LM): 12615