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在进行室内天然光传递量计算时，可近似把室内各表面看成是漫反射表面。所以当一束光从室内某一个表面上反射出来后，它究竟射向哪一个面是不确定的，也就是说实际墙面的反射光方向是随机的。但是，经过各个面之间的相互反射后，这个光通量传递过程却具有规律性。因此可把室内各表面之间的光通量传递这个事情，认为是一个随机事件。 由实验确定，可见光的波段范围约位于３８０ｕｍ和７８０ｎｍ之间，这是人眼明视响应的近似极限，这个极限两端的界限是不分明的，是模糊的。因此可见光的外延是模糊的，所以一切与可见光有关的量均具有模糊性。于是就把室内光通量传递这个事情看作为一个模糊随机事件，并用模糊数学中的模糊随机事件的概率计算。 在一个封闭的长方体空间里，将所有内表面划分为 ｎ（ｎ≥６整数）个小矩形面，并用Ｂ１，Ｂ２，…，Ｂｊ，Ｂｎ表示在这ｎ个小矩形面Ｓ１，Ｓ２，…，Ｓｊ，Ｓｎ，之间、经过相互反射后获得的“相对光通量”增量这ｎ个事件。所谓“相对光通量”指的是取这ｎ个面上的最大光通量值作为单位时所表示的光通量，它等于射到任意面ｊ上的光通量Ｆｊ这ｎ个面中的最大光通量Ｆｍａｘ（Ｆｍａｘ÷≠０）之比值 Ｆ′ｊ＝Ｆｊ／Ｆｍａｘ（ｊ＝１，２，…，ｎ）（１）并有０?
When calculating the indoor natural light transmission amount, each indoor surface can be regarded as a diffuse reflection surface. Therefore, when a beam of light is reflected from a certain surface of a room, it is uncertain which face it actually shoots to, that is, the direction of the reflected light of the actual wall surface is random. However, after mutual reflections between the surfaces, the light flux transfer process has regularity. Therefore, it is possible to transfer the luminous flux between the indoor surfaces to a random event. It was determined experimentally that the wavelength range of visible light lies between 380 μm and 780 μm, which is the approximate limit of the visual response of the human eye. The limits at both ends of the limit are unclear and fuzzy. Therefore, the extension of visible light is ambiguous, so everything related to visible light has ambiguity. Therefore, the incident of indoor luminous flux is regarded as a fuzzy random event, and is calculated by the probability of fuzzy random events in fuzzy mathematics. In a closed rectangular space, all inner surfaces are divided into n (n≥6 integers) small rectangular planes and denoted by B1,B2,...,Bj,Bn in these n small rectangular planes S1,S2,..., Sj, Sn, the “relative luminous flux” increments between these two events that are obtained after mutual reflection. The so-called “relative luminous flux” refers to the luminous flux expressed by taking the maximum luminous flux value of the n planes as a unit, and it is equal to the maximum luminous flux Fmax (Fmax) out of the n planes of luminous flux Fj impinging on an arbitrary plane j. 0) The ratio F’j = Fj/Fmax (j = 1, 2, ..., n) (1) and 0?