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Abstract
In this paper, the technology of an energy-conserving incandescent lamp is described. The lamp has a spherical envelope coated with a multilayer heat mirror of TiO2-Ag-TiO2. The coated envelope focuses the infrared radiation back to a centered compact filament of high emissivity while transmitting the visible wavelengths. The energy savings depend on the emissivity of the filament and the effective reflectance and visible transmittance of the coated envelope. Performance has been evaluated both in a model lamp system and in actual lamps.