1exterior light box,60% thicker 2 brighter,superficial lumen 1500,long light span 3 discolour resist 4 easy to maintain Company info We have 10 years experience in manufacture advertising equipment such as exterior light box,showcase,sign panel,display rack,booth and so on. We are processing the metro sign and indoor light box project for Shenzhen City. Good quality,lower price,shorter delievery, ...