USHIO G20T10 19W Germicidal Low Pressure Mercury-Arc Lamp 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 bulb, 19W, Base: G13 2-Pin, Rated Life (hours): 8000, Color Temp: , Luminous Flux (LM):