Virtually Invisible Emergency Lighting. The Revelation Series is architecturally designed for unobtrusive use in walls with cavity dry wall with 4 inch studs or un-insulated ceilings with horizontal beams or T-bar structures. In normal conditions stand by the unit is completely concealed in the wall or ceiling. In case of power failure the door of the unit rotates open 180 degree and exposes the emergency lights to illuminate the path of egress. Once AC power returns or at the end of discharge period, the lights turn off and the door rotates closed automatically, driven by a patent-pending, energy storage circuit. If needed the backbox can be shipped separately.