Overdrive 212, (06-Pack), 400-Watts Equivalent Mercury Vapour (Self-Ballasted), 85W High Wattage Spiral Compact Fluorescent Light Bulb, 80 CRI, (Daylight) Full spectrum Overdrive 85W Spiral Compact Fluorescent Light is equivalent to 400 Watts Mercury Vapour (Self-Ballasted) saves up to $346.5 over lifetime of the bulb (based on 3 hours/day usage, 11 cent/kWh) With 78% 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 Instant ON, Flicker-Free with brightness 5800 lumens, provides energetic, daylight with full spectrum 5000K color temperature. Ideal uses include high and low bays, gymnasiums, warehouses, churches, wall packs, shop floors, parking garages etc.