Osram HBO103W/2 Long Life 20 Volt 100 Watt Short Arc Mercury 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 OSRAM bulb, 103W, Base: SFa7.5-2, Rated Life (hours): 300, Luminous Flux (lm): 2550