Esimtate sky illuminance from the irradiance contained within a WEA object.
wea [Required]
A Ladybug WEA object.
dew_point [Required]
An annual data collection representing dew point temperature [C].
dir_ill
A data collection of direct normal illuminance values at each timestep of the WEA.
diff_ill
A list of diffuse sky solar illuminance values at each timestep of the WEA.
glob_ill
A list of global horizontal illuminance values at each timestep of the WEA.
