Skip to main content

17-29-123

cie

e-ILV

The e-ILV provides free access to all the terms and definitions contained in the international standard CIE S 017:2020 ILV: International Lighting Vocabulary, 2nd edition.

To search for another term please use  "Back to the list" to return to the main page or the e-ILV.

For the complete set of terms and definitions CIE S 017:2020 can be purchased from the CIE Webshop. Members of a CIE National Committee or Associate National Committee have access to a 66,7 % discount on the purchase price of the standard.

For advice on CIE Publications contact ciecb@cie.co.at. Please note that the CIE CB may not be able to assist with enquiries of technical nature.

externally reflected component of daylight factor

De

quotient of that part of the illuminance at a point on a given plane in an interior which is received directly from external reflecting surfaces illuminated directly or indirectly by a sky of assumed or known luminance distribution and the illuminance on a horizontal plane due to an unobstructed hemisphere of this sky, where the contribution of direct sunlight to both illuminances is excluded

Note 1 to entry: When calculating the lighting of interiors, the contribution of direct sunlight has to be considered separately.

Note 2 to entry: The externally reflected component of daylight factor has unit one.

Note 3 to entry: This entry was numbered 845-09-99 in IEC 60050-845:1987.

Note 4 to entry: This entry was numbered 17-422 in CIE S 017:2011.

Publication date: 2020-12
Copyright © CIE 2020. All Rights Reserverd.