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Hi all, Referring to DesignBuilder v4.7, from which source are taken illuminance data when you are performing a daylight calculation,? I mean, the calculation gives as output lux values on the working plain height selected, but which are the starting values of illuminance? (This excludes option "6- CIE overcast sky (specify illuminance)" in wich you can put illuminance value at zenith point). I've a feeling that the initial illuminance data are built only from latitude and longitude of the location, that is, they do not take into account any irradiance or illuminance data contained in the EPW file. Can someone confirm what i'm guessing? (in the help i've not found reference about this issue) Thank you Alessandro

Hi all, Referring to DesignBuilder v4.7, from which source are taken illuminance data when you are performing a daylight calculation,? I mean, the calculation gives as output lux values on the working plain height selected, but which are the starting values of illuminance? (This excludes option "6- CIE overcast sky (specify illuminance)" in wich you can put illuminance value at zenith point). I've a feeling that the initial illuminance data are built only from latitude and longitude of the location, that is, they do not take into account any irradiance or illuminance data contained in the EPW file. Can someone confirm what i'm guessing? (in the help i've not found reference about this issue) Thank you Alessandro