PERFECCIONAMIENTOS INTRODUCIDOS EN UNA LAMPARA ELECTRICA DE INCANDESCENCIA.

摘要

The thermal radiation which is emitted by an electric incandescent lamp is eliminated according to the invention by providing an incandescent lamp with a filter which transmits visible light and which reflects infrared radiation, which filter consists of an interference filter and a heavily doped metal oxide filter which is disposed at the side of the interference filter which is remote from the filament body.