1 double sided light box,60% thicker 2 brighter,superficial lumen 1500,long light span 3 discolour resist 4 ... manufacture advertising equipment such as metro guiding double sided light box,showcase,sign panel,display rack,booth and ... mall,business street,airport and so on.As light box or sign is available.Product specification Frame: ... from dust. aluminum outdoor/indoor double sided light box signage