在采光设计和光照能量分析中,所假定的原始天空条件非常重要,就采光设计而言,关键是如何满足最低设计要求,者或说是了解最低的天空条件,世界上有些地区以某种天空条件为主,象欧洲以阴天天空条件为主,干燥的赤道地区以晴天天空条件为主,对于这些地区来说,采光设计可以以某种天空条件作模型进行考虑。但对于 In the lighting design and lighting energy analysis, the assumed original sky conditions are very important. As far as the lighting design is concerned, the key is how to meet the minimum design requirements, or to understand the minimum sky conditions. Some regions of the world use some sort of sky. The main conditions are as follows: Europe is dominated by cloudy sky conditions, and the dry equatorial region is dominated by clear sky conditions. For these areas, lighting design can be considered as a model of certain sky conditions. But for