Insight is a handy tool if you want to stay within the Autodesk ecosystem, but it comes as a cost. For more information on sky models and irradiance values, refer here. Alternatively, you can enable ‘use weather data’ which will use weather data from the closest weather station to your defined location (refer Step 2). You also have the option to specify the sun’s intensity by entering irradiance values: Direct Normal Irradiance (DNI), Diffuse Horizontal Irradiance (DHI), and Global Horizontal Irradiance (GHI). The location or time of day does not matter if you are using a Daylight Factor Sky. This number is the percentage of natural light falling on surfaces compared to that which would have fallen on a completely unobstructed horizontal surface under same sky conditions. When you choose the Daylight Factor Sky, your results will be expressed as a percentage. If you know what kind of sky you will have, or you’re trying to get values for a particular situation (clear or overcast), then it is a good idea to use a CIE model. They provide standard conditions for daylighting applications (Overcast sky, Intermediate sky, Clear sky, and Uniform sky).
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