Foil for room-lighting unit, allows control of room-lighting device for producing a natural daily sequence of color temperature and brightness

摘要

A printed foil or film is tensioned in a frame, is made light- transparent, has a UV-light resistant color and is specifically built into a room lighting device. Independent claims are given (A) for a lighting device, (B) for an electronic ballast and (C) for a method of using the device.