Abstract:Experiment of 23 materials under similar lighting condition show that the physical illuminations of different construction materials have widely discrepancy. Lighting level is decided by reflectance,and the illustriousness changes with various angles of incidence and viewing.Consideration of other impact factors, modified coefficient K obtained from experimental values amends the computing formula recommended by the International Commission on Illumination(CIE),and then a new formula is derived.Compared with the original computing formula,an effective energy saving is achieved.
