USHIO LU-250W E39 ED28 High Pressure Sodium 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 Ushio ED28 bulb, 250W, Base: E39 Mogul Screw, Rated Life (hours): 24000, Color Temp: 2000K, Luminous Flux (LM): 28500