1 strong light box,60% thicker 2 brighter,superficial lumen 1500,long light span 3 discolour resist 4 easy to maintain Company info ... metro station,mall,business street,airport and so on.As light box or sign is available.Product specification Frame:stronger,thicker ... / oxygen/chemical/discolour resistance,7 years long span Screen(Sticker): light-proof sticker,2 years span outdoor,3 years span indoor ...