How is daylight rate calculated?
According to the location of latitude and longitude, floor height, floor spacing to calculate the annual lighting situation
The calculation method of lighting rate mainly includes the calculation of indoor natural illumination according to the size, quantity and location of the window, or the required window area according to the daylight factor prescribed by the daylighting standard. In addition, there are glare calculations. In order to simplify the calculation, an ideal standard sky brightness distribution is usually defined as the calculation condition. Most of the countries in China and in the world use the cloudy sky brightness distribution as the standard light source for lighting calculation.There are ten kinds of lighting calculation methods published all over the world. These methods are mainly based on two different bases which are derived from photometric theory and measured data based on daylight model experiment. The forms of expression include graph method, number solution method and tool method.
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