室内照度区域光效法

An Approach to luminous Efficacy in Indoor's Illuminance Area

一个由半透明、不透明材料及开口围成的圆球壳体，球心设一点光源，则壳体的平均透光系数和内表面的平均反射系数可求，故该壳体的光效率可求。把一个室内照明环境，分成照明空间和地板空间．并看成是在工作面相接的两个壳体，因此地板空间和照明空间的光效率可求。照明空间因地板空间的光回受再分配，可求得照明空间总的区域光效率 。 由于灯具与点光源的配光存在差异，照明空问与球壳、灯具不在形体中心的差异，引入配光系数Ｋ１和形位系数Ｋ２对区域光效率 进行校正，并考虑照度的维护系数Ｋ。则最终获得一种新的室内平均照度计算法，即区域光效法。

An indoor luminous environment may be divided into two parts of lighting space and ground space. which are joined on working plane when considered to be two half circular shells. Then, the luminotis efficacies of lighting space and ground space are obtained. In ground space, the product of i~ and luminous flux reflected from ground space enters into linghting space so that it may take part in renewing the ltiminous flux. Adding up the flux by lighting space on working plane, it becomes the luminous efficacy in lighting space. Due to the difference between the itt-minous intensity distribution of a htminarie and a point source, and the geometric figures of real lighting space and circular shell, and generally the lamp does not lie in the center of indoor space, The luminous intensity distribution index K1 and the shape-location index K2 are introduced into the formula so as to correct the luminous efficacy ii,, moreover, with a maintenance factor K0, the following formula of indoor average illuminance on working plane may be obtained.