17-825

normal solar illuminance [En]

illuminance produced by direct sunlight on a surface on the Earth that is perpendicular to the direction of illumination by the Sun

Unit: lx = lm·m-2

NOTE This is not the same as direct solar illuminance, which is measured on a horizontal surface on the Earth, not necessarily perpendicular to the direction of illumination by the Sun.

Theme by Danetsoft and Danang Probo Sayekti inspired by Maksimer