Ushio BC2770 G8T5 7.2W Germicidal Low Pressure Mercury-Arc Lamp, 12" x 1" x 1" Hid bulbs produce high output for their size making them a compact powerful & 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, 7.2W Base: G5 2-pin, rated life (hours): 8000, color Temp:, luminous flux (lm)