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. It can be used in a top light or multi-layer application. 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 with the use of the EL1 or EL2 controllers. The 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. Power cords sold separately to operate at your desired voltage. Dimensions 44.1 in x 44.1 in x 2.1 in. 630 watts.