The relationship between daylight-induced melanopic illuminance and sky conditions based on MEL ratios

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  • メラノピック照度比率に基づく昼光によるメラノピック照度と天空条件の相互関係
  • メラノピック ショウド ヒリツ ニ　モトズク チュウコウ ニヨル メラノピック ショウド ト テンクウ ジョウケン ノ ソウゴ カンケイ

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Abstract

With the diversification of office environments, the importance of improving the well-being of office workers has been emphasized, and the re-examination of the light environment in the office has become more active. Melanopic illuminance, a new measure of light that affects the quality of sleep of office workers, has been attracting particular attention. The Melanopic illuminance is usually measured using a spectroradiometer, but it is not suitable for multipoint measurement in offices due to various physical factors. In addition, the light environment in an office consists of a mixture of artificial and natural light, and the spectral distribution of daylight varies depending on various factors such as time of day and weather. In this study, we focus on sky conditions as a source of variation in the spectral distribution of daylight, and propose a simple method for estimating Melanopic illuminance by illuminance by analyzing and quantifying the relationship between Melanopic illuminance and illuminance under various conditions. The results show that the factors that affect the spectral distribution of daylight are the weather, time of day and solar orientation as sky conditions.

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