1 ft. x 4 ft. White Integrated LED Dimmable Edge Lit Panel, 4000K (4-Pack)Dimmable Hyperikons modern grid ceiling LED is dimmable and free from flickering buzzing, adjust the brightness smoothly throughout the day for proper mood and increase productivity Edge lit the ultra thin design on these led panels makes it a lightweight ceiling fixture, edge lit troffer panels have the led source located on the sides of the panel which illuminates dark spots corners and provides a more pleasant light distribution Efficacy this high