Advantages of Our Upgraded Ultrathin LED Grow Lights: Benefits for Plants and Aquarium Fishes Professional UFO SMD LED Bulbs Larger Lighting Coverage Much Safer and Lower Damage Rate Design Longer Life Span 1/4" thick Safe and environmental Friendly(saves 50% to 90% in energy consumption) Convenient Power(AC100-250V full voltage with U.S. standard plug) Specifications: Output Voltage: DC18-55V Power Supply: AC85-265V Frequency: 50/60Hz Output Current: 500mA plus-minus 5% Input Current: 0.4 A max Power: 27.5w in total Adaptor Power Conversion Rate: PF>0.95 Wavelength: Blue(450nm), Red(660nm), Orange(630nm), White(7700K Color Temperature) LEDs Diameter: 5mm Working Temperature: -10C to 50C Working Humidity Less than 95% Power Cord Length: 25" Light Panel Size: 11-1/4" L x 11-1/4" W x 1/5" H Recommended Height Within 3.28 feet high above plants Recommended Coverage: One panel per 21-1/2 to 32-1/4 square feet Package Contents: 4x The 6th Generation Ultrathin LED Light Panel 4 Set Hanging Kit