... 3.Up to 90% energy saving 4.Environmental-protection Frontlit LED Channel Letter Sign have the advantage as following:1.CE ,RoHS and ... , environmental-protection and colorful-visible day and night4.Laser cut acrylic on the face,304# stainless steel with brushed, polished or ... ,school signs ,advertisement, architecture, decoration, exhibition, and lighting, etc. Frontlit LED Channel Letter Sign