... (square, rectangle)5 Dimmable optional6 High quality light source. The attenuation of SMD LED light source is less than 3% by 3,000hrs ... aging test under temperature 50 degrees celsius, high luminous efficiency of single LED ... lights for your reference: 1.Round panel: Power: 8W, 10W, 12W, 16W, 20W,25W,36W,40W Size: D155*18mm, D180*18mm ...