Led linear Direct light with 130LM/W,Available single or Tunable CCT & watt and Smart RGBW optional, 0-10 dimming,No Flickering,100-277V/347V/220V,ETL CETL and DLC5.1 listed.4 covers UGR diffuser,Honeycomb,louvers,diffuser.size 2FT,4FT,8FT,linkable or Connect To L,T,X,Y different Shapes.You can add the Emergency power supply locally by yourself.also can do with moution sensor.It's a Modern commercial Ceiling,Wall,Surface Mount,Recessed ,pendant lighting fixture.suitable for installation on multiple ceiling types.