| 摘要 |
PROBLEM TO BE SOLVED: To make brightness almost the same with one lamp by constituting with plural filaments having different color temperatures but almost the same luminous flux in lighting, and an envelope for housing the filaments. SOLUTION: Filaments 6a, 6c with different color temperatures but almost the same luminous flux r1 and r2 in lighting are arranged up and down within an envelope 1. An incandescent lamp like this is fit to a lighting fixture, and when the filament 6a is lit, light emitted from the filament 6a has color temperature, around 5000 deg.K for example near to daylight, and an illuminated object looks like color near to natural light. When the filament 6c is lit, light emitted from the filament 6c has color temperature, around 2600 deg.K for example, and looks like orange color near to dawn. Since both filaments 6a, 6c are designed so as to have almost the same brightness, even if color temperature is different, brightness is the same.
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