... aluminum frame: 30mm;Thickness of light box: 21mm;Thickness of LGP( light guide panel): 4-5mm;Light source: bright LED strips;Structure: ... sliver;Size: customized by client’s requirement;Application: widely used for advertising of super market, train store, brand shop, ... ceiling, Etc.Certification CE,CCC,ROHS, etc.Application widely used in business centre ,chain stores, railway stations,banks, malls ...