The Luminous Efficacy of an Incandescent Lamp Which has an Infrared Reflective Film

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  • 赤外線反射膜付き電球の効率
  • セキガイセン ハンシャ マク ツキ デンキュウ ノ コウリツ

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Abstract

An energy conserving incandescent lamp which the infrared reflective film has been studied.<BR>This lamp can be called the heat mirror lamp, because it has an envelope internally coated with a multilayer heat refl ective mirror such as consisting of Ti02-Ag-Ti02.<BR>A theoretical formula which led the luminous efficacy and the energy conserving ratio of the lamp could be found.<BR>Those are depend on the spectral transmittance and reflectance of the heat mirror, the spectral emissivity of the radiator and the geometrical factor of the lamp components.<BR>In case of the spherical envelope lamp with tungsten coiled coil filament at the center, a geometrical factor of 0.63 has been experimentally obtained, and the luminous efficacy of 27 lm/W can be expected by using the Ti02-Ag-Ti02 film coated lamp.<BR>An experimental luminous efficacy of the lamp with a bulb internally coated with a thin gold film almost coincides with the results of theoretical calculations.

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