Overdrive 214, (06-Pack), 500-Watts Equivalent Mercury Vapour (Self-Ballasted), 105W High Wattage Spiral T5 Compact Fluorescent Light Bulb, 80 CRI, Cool White Overdrive 105W Spiral Compact Fluorescent Light is equivalent to 500 Watt Mercury Vapour (Self-Ballasted) saves up to $434.5 over lifetime of the bulb (based on 3 hours/day usage, 11 cent/kWh) With 79% Energy Saving and long life of 10,000 hours, it lasts up to 9.1 years (based on 3 hours/day usage) High Luminous efficacy, Non-Dimmable. 105W Spiral T5- CFL-Cool White-277V Mogul Base Instant ON, Flicker-Free with brightness 7150 lumens, provides energetic, cool white (4100K) Ideal uses include high and low bays, gymnasiums, warehouses, churches, wall packs, shop floors, parking garages etc.