Electriclight ingcomprises
515,000,000MWhor20%ofthe
nation's electricity consumption.Of
thistotal,approximately10-15%is usedto lighta building's perimeter
zonewheredaylightisalready
present.For daytime-occupied com-
mercial buildings,research projec-
tions show thattotalelectricity and peak demandsavingsof20-40% in
lightingandits associatedcooling
energycanbeachievedwiththe
proper use of dimmable daylighting
cont rolst hroughoutt heUnit ed States.

Evenwiththeavailabilityofmore
energy-efficientlamps,electronic
ballasts, and alternative control sys- tems, the potential for daylighting is
substantial.