When you want to keep shadows to a minimum, these edge-lit panel lights provide high performance and versatility. Producing 5700K of white light, these panels provide bright illumination you need while dimming with ease when a softer touch is required. They generate 4000 lumens for only 40 watts of energy, providing a 75 percent energy savings over traditional troffer fixtures. Better yet, they can be used in damp locations. These panels come in packs of four, offer a five-year limited warranty, and 50,000 hours of life. Finish White Made of Aluminum 4000 lumens white SMD LED bulb with INTEGRATED LED ; 2.07 inches tall; 23.74 inches wide Edge-lit LED construction helps eliminate shadows while giving high performance Estimated yearly energy cost 4.818 based on 3 hours/day, 11 cost depends on rates and use . Average life based on 3 hours per day is 50000 hours 2X36W/2X40WGrille fluorescent W INTEGRATED LED Bulb s Bulb Color Temp 5700K Bulb CRI 80 Bulb Lumens 4000 Lamp Type SMD LED LED Type Epistar Voltage 100-277V Beam Angle 120 Lens Acrylic Style SURFACE MOUNT Current 960mA Dimmable Yes Average Life 50000 Energy Star No For Use in Damp Locations Warranty Info 5 Overall Dimensions 23.74 L x 23.74 W x 2.07 H Item Weight 7.59 lbs. Please note that this product is designed for use in the United States only 110 volt wiring , and may not work properly outside of the United States.