Features: 1) 90 X 1w led grow light produce great effect as 400W to 600W HID grow light save 75%--85% on electricity. 2) Lifetime reaches 50,000 hours. 3) UFO LED plant grow lights use only the exact spectrums (R&B) required for plant photosynthesis.(show you what wavelength range is the best for plant growth). 4) Built-in cooling system (thermostatically controlled fans ) solve the heat dissipation excellently. 5) Built-in power supply, CE approved, No setup required, just simpler and safer plugs directly into AC120V/220V, no reflector & ballast needed.(show you detail use pictures). 6) The low heat emission eliminates the need for ducting & heat exhaust fans. 7) Environment-friendly: Dont contain the harmful substance HPS & MH have, much less hazardous waste to deal with. 8) Each light covers at least 1-4 square meters (0.3m-0.6m high away from plant), 120 degree beam angle make its lighting area reach 40-80 square meters (2m-3m high away from plant). 9) Ideal for all phases of plant growth, and works well with any indoor garden, whether hydroponics or soil based.