Vertical Illuminance -

Japanese: 鉛直面照度 - えんちょくめんしょうど
Vertical Illuminance -

…In this case, the illuminance E (unit: lx) obtained at point P is called the cosine law of the angle of incidence. Depending on the plane considered, illuminance can be normal illuminance, horizontal plane illuminance, or vertical plane illuminance. It can be described as follows using Figure 7. …

*Some of the terminology explanations that refer to "vertical illuminance" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…この場合,点Pに得られる照度E(単位はlx)は,これを〈入射角の余弦法則〉という。 さて,考える面によって,照度には法線照度,水平面照度,鉛直面照度がある。図7によって記述すると次のようになる。…

※「鉛直面照度」について言及している用語解説の一部を掲載しています。

出典|株式会社平凡社世界大百科事典 第2版について | 情報

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