上半球的光通量辐射问题非常广泛和复杂。本文讨论了垂直表面散热器的建模。它提出了一种统一这些类型光源行为的方法。这些将被理解为余弦辐射器。如果考虑该余弦分布曲线，则只能知道亮度和光活性表面，以补充关于此类光源辐射的信息。从实际现场测量中可以相对容易地获得亮度和辐射表面。本文介绍了将这些数据应用到照明计算中，以及创建这些表面的辐射计算所需的分布曲线。 它还分析了亮度和有效面积对辐射光通量的影响，并将这些值分配给实际散热器。

The issue of the luminous flux radiation to the upper hemisphere is very broad and complex. The paper deals with the modelling of the vertical surface radiators. It presents an approach to unify the behaviour of these types of light sources. These will be understood as cosine radiators. If this cosine distribution curve is taken into account, then only the luminance and the light-active surface can be known to supplement the information about the radiation of such the light source. The luminance and radiated surface can be obtained relatively easily from real field measurements. The article presents the implementation of this data into lighting calculations and the creation of the distribution curves which are necessary for the radiation calculations of these surfaces. It also analyses the influence of the luminance and active areas on the radiated luminous flux and assign these values to the real radiators.