nurk vaatlejat ja vaadeldavat punkti läbiva orienteeritud püsttasandi ja vaadeldavat punkti ning valgustit läbiva orienteeritud püsttasandi vahel arvestades heledustegurit
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Ühik: radiaan, kraad
angle between the oriented vertical planes through the observer to the point of observation and from the point of observation through the luminaire with respect to luminance coefficient
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