Question-and-Answer Resource for the Building Energy Modeling Community
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I don't believe you can do this with illuminance map. However, there are output variables to measure solar insolation:
Output:Variable,*,Site Solar Azimuth Angle,hourly; !- Zone Average [deg]
Output:Variable,*,Site Solar Altitude Angle,hourly; !- Zone Average [deg]
Output:Variable,*,Site Solar Hour Angle,hourly; !- Zone Average [deg]
Output:Variable,*,Site Diffuse Solar Radiation Rate per Area,hourly; !- Zone Average [W/m2]
Output:Variable,*,Site Direct Solar Radiation Rate per Area,hourly; !- Zone Average [W/m2]
Output:Variable,*,Site Exterior Horizontal Sky Illuminance,hourly; !- Zone Average [lux]
Output:Variable,*,Site Exterior Horizontal Beam Illuminance,hourly; !- Zone Average [lux]
You can read about these variables here.
If you need insolation on a particular surface you might try putting in a solar cell with 100% efficiency to measure solar input.
