LED ceiling lighting with 2 LED strips inside covered with single Area light for simple and faster to render lighting. If you want it more real and take longer to render you can just hide area light and give higher value to emission. Light sits with 5mm gap from ceiling.
!DON'T FORGET that this light works only with shadow caustics on, if you are not using caustics pull area light outside of the light and make led strip emission higher for it to work properly.