... it is the best way to realize a liner lighttransforming to a flat light by the light beams reflecting and dispearing to leakout of the board ... aslight energy wastage,low efficiency,bad effect and thickness,ect.The size for light panel:1500mm*3000mm,1200mm*2400mm,1000mm* ... 1500mm,900mm*1200mmwe can also make the light panel according to your requirements.l 2012 new style led countdown ...