Hi again 
I am trying to conduct a parametric study for LEED sDA and ASE measure. So I believe I need the data for Solar Illuminance… Unfortunately, @Lukas told me that the Shinny Weather Data have no illuminance data. However, he pointed out a strategy towards the conversion of Irradiance to Illuminance on Unment Hours forum:
‘’
7.2.5 Direct Normal Solar Illuminance
For purposes of calculating daylight factors associated with beam solar illuminance, the direct normal solar illuminance is taken to be 1.0 W/m2. The actual direct normal solar illuminance, determined from direct normal solar irradiance from the weather file and empirically-determined luminious efficacy, is used in the time-step calculation.
‘’
So that means that I can empirically use Direct Solar Irradiance as Direct Solar Illuminance for lighting calculations. But how do I get the Diffuse Horizontal Illuminance? 
The IWEC2 weather files by ASHRAE include solar Illuminance. However, they are also derived empirically, and the path is unclear.
Because the ISH database contains no measured solar radiation, the hourly total horizontal solar radiation is calculated using an empirical Zhang-Huang Model based on the sun-earth geometry, reported cloud cover, temperature difference from three hours previously, relative humidity, and wind speed, which is then adjusted on an hourly basis using the new ASHRAE Clear Sky Model to correct for statistical noise in the hourly profile. A second empirical Gompertz Function Model is used to calculate the direct normal solar radiation based on the solar angle and the ratio of the derived total global horizontal compared to the extraterrestrial solar radiation. Other models then use these derived solar radiation values to calculate various illuminances (global horizontal, direct normal, diffuse horizontal) and zenith luminance that are useful for daylighting studies.
The “Other models” is the tricky part…
Despite the fact that:
perhaps I still can convert Irradiance values to Illuminance?
If so, how could it be done?
Or maybe there is a known source of solar illuminance database?
I would really appreciate your help.
I leave the dataset from ShinyWeatherData bellow.
lat=49_lng=24.75_period=2019(CAMS).epw|attachment (1.2 MB)