ISO/CIE联合标准ISO 15469:2004（E）/CIE S 011/E:2003国际电工学会于1996年发布了标准“CIE S003日光空间分布——CIE标准阴天和晴天”。从那时起，研究了更多类型的天空，并就其亮度分布和标准化达成了国际共识。天空的亮度分布取决于天气和气候，并在一天中随太阳的位置而变化。本标准列出了一组亮度分布，用于模拟从阴天到无云天气等各种条件下的天空。 它有两个目的:i.作为测量天空亮度分布分类的通用基础ii。给出一种在采光设计程序中计算天空亮度的方法。本标准定义了相对亮度分布:天空任何一点的亮度都是天顶亮度的函数。为了进行采光计算，可将其与天顶亮度值或水平照度值一起使用，以获得绝对亮度分布。本标准包括CIE标准晴天和CIE标准阴天，这两种天空被视为一般天空的特殊情况。 阴天被保留为一个单独的公式，因为有许多计算程序体现了这个特定分布的数学公式。本标准取代了CIE S003-1996《日光的空间分布——CIE标准阴天和晴天》和ISO 15469:1997。本标准已获得CIE和ISO的批准。

Joint ISO/CIE StandardISO 15469:2004 (E) / CIE S 011/E:2003CIE has published the standard "CIE S003 Spatial distribution of daylight - CIE standard overcast sky and clear sky" in 1996. Since then further types of skies were examined and an international consensus was reached on their luminance distribution and standardization.The luminance distribution of the sky depends on weather and climate, and it changes during the course of a day with the position of the sun. This standard lists a set of luminance distributions, which model the sky under a wide range of conditions, from the heavily overcast sky to cloudless weather. It is intended for two purposes:i. to be a universal basis for the classification of measured sky luminance distributionsii. to give a method for calculating sky luminance in daylighting design procedures.This Standard defines relative luminance distributions: the luminance of the sky at any point is given as a function of the zenith luminance. For daylighting calculation purposes it may be used with values of zenith luminance or of horizontal illuminance to obtain absolute luminance distributions.This Standard incorporates both the CIE Standard Clear Sky and the CIE Standard Overcast Sky, which are treated as particular cases of the General Sky. The Overcast Sky is retained as a separate formula because there are many calculation procedures that embody the mathematical formulation of this particular distribution.This present Standard replaces CIE S003 - 1996 "Spatial distribution of daylight - CIE standard overcast sky and clear sky" and ISO 15469:1997.This standard has been approved by CIE and by ISO.