Goodbulb's GBLEDHB325W5K2X4 4 foot Linear High Bay Fixture provides 42,250 lumens at 5000K Daylight White. Energy (and cost) savings of up to 65% over the lifespan of this fixture. Rated for over 50,000 hours of use, about 23 years at 6 hours/day. Perfect for a variety of commercial applications including warehouses, buildings, supermarkets, gyms, retail spaces, and manufacturing facilities. It features a 1-10V Dimming range with a high quality isolated driver. No flickering or noise from LED Driver. Easy installation with pendant and chain mount. Chains and brackets included.