Relation between Illuminance and Irradiance under South Climatic Conditions

The conversion relationship between illuminance(E) and irradiance(L) under south climatic conditions was studied.The test eventuated as follows: in sunshine day,the relationship was E=0.0137L+0.5837;in cloudy day,the relationship was E=0.0109L-19.654;and in overcast day,the relationship was E=0.0096L-4.5141.