The Gavita Pro 1650e LED is a 1650 µmol s-1 fixture with an impressive efficiency of 2.6 µmol s-1 per watt. The Pro 1650e delivers broad coverage with its 8 passively cooled LED bars. The 8-bar configuration allows you to use it in low rooms, over single benches, or even in 4 x 4 ft or 5 x 5 ft tents. This powerful, full-spectrum light source is intended for full term plant growth from the vegetative stage to the higher light requiring bloom stage. Fixture is dimmable to 50% without any loss of efficiency with the use of the Master Controllers. The ESA1 adaptor #906146 (sold separately) is needed for each fixture when using the controller. This fixture is built with high-quality 120-277 volt Philips brand drivers. Sun Grip® light hangers are included for hanging the fixture. Dimensions 44.1 in x 44.1 in x 2.1 in. 630 watts.