Illuminant for reflecting infrared radiation, has layer system transparent to visible light and partially surrounding illuminant, where system has three layers, of which two are made up insulator and third is made up of transparent metal

摘要

The illuminant has an illuminating body that is surrounded by a bulb (11) e.g. quartz bulb and a hard glass bulb. A layer system is partially surrounding the illuminant and is transparent to visible light. The system that is arranged on an inner side of the bulb includes three layers (20, 30, 40). The layers (20, 40) are made up an insulator or a dielectric, and the layer (30) is made up of a transparent metal.