Daylight availability in Hong Kong and energy implications

Measurement and analysis of outdoor illuminance have been reported for Hong Kong. Regression analysis of the measured data indicates that both global and diffuse illuminance can be correlated with solar altitude under different sky conditions. Cumulative frequency distributions of outdoor daylight availability suggest that in more than half of the working year, daylighting alone can provide adequate lighting level in the perimeter zones of most office buildings. Likely energy savings in electric lighting for a generic office building has also been estimated.