A device, kit, and method for a luminaire having a first LED module with a first length and a plurality of LEDs, said LEDs disposed at predetermined pitch. The buffer is to store data samples for an isochronous data transmission. Thus, it is possible to reduce stress occurring on an edge of the second pad metal, thereby reducing damage on the interlayer insulating film and so on. When a signal level of the central signal is smaller than both signal levels of the two circumferential signals with respect to even one set of three signals, the signal level of signal is decreased.