StandardsproducedbytheCommissionInternationaledel’Éclairage(CIE)areaconcisedocumentationofdatadefiningaspectsoflightandlighting,forwhichinternationalharmonyrequiressuchuniquedefinition.CIEStandardsarethereforeaprimarysourceofinternationallyacceptedandagreeddata,whichcanbetaken,essentially