... energy 80%. 4.Special size is ok 5.Long lifetime. Ultra Slim Led light box specification:(1) Normal Size: A4,A3 ... panel, silk prink frame, T4/5 OR LED lighting source. Ultra slim, four side open.(4) Long life time 60000HOURS,3W ... center,supermarket,airport,station,subway,bank,busstation,large exhibition project. Ultra Slim lightboxes