A lumen method for sidelighting has been developed for clear windows u
sing coefficients of utilization based on the solar profile angle. CUs
are provided in graphical form for both clear and overcast skies. The
se values are based on a finite element model performed with the SUPER
LITE analysis program. Overhangs are considered using a view factor fo
r the overhang that includes both direct and reflected light. Good agr
eement between this method and complex models for a range of solar pos
itions and building configurations is shown.