... 1 metro signs, 60% thicker 2 brighter,superficial lumen 1500,long light span 3 discolour resist Company info We have 10 years experience ... chemical/discolour resistance,7 years long span Screen(Sticker): light-proof sticker,2 years span outdoor,3 years span indoor Light source:t8 philip ... ,hard to be broken,turn color 2 years span outdoor,3 years span indoor Hook:inner is metal tube,outer decoration ...