白熱光源の効率はどこまで向上可能か : マイクロキャビティ光源とクラスター光源(<特集>白熱電球130年の歴史と将来(白熱電球は本当に不要か?)) [in Japanese] Can the Efficacy of the Incandescent Source be Improved in How Far? : Microcavity Lamp and Cluster Source(<Special Issue>130Years of History and the Future of the Incandescent Lamp) [in Japanese]
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In the past in which Edison invented the electric lamp, the human had worked below the daylight, and took the meal and rested under the burn light in the night over one billion several years. Therefore, the human senses the color of foods illuminated by the burn light in the palatable color and the burn light is "comfortable light" by which the mind and the body are cured. The quality of light of the incandescent lamp is the homogeneity in the burn light. It is studied, in this paper, that the microcavity light source and the cluster light source are expected as light sources where luminous efficacy and lifetime are equal to the fluorescent lamp.