Reviewing Avg Daylight Factor Methodology

grasshopper honeybee-legacy
2
  1. The default Radiance parameters can give you a high error. See this: DF variations in different runs
  2. If the values are less than expected and you are using the version from Food4Rhino and not the one from GitHub see this: Ground Light in Daylight factor

In any case, if you provide the expected results it will be easier to answer to this question.