The tools for describing the performance of daylighting
systemsarelimited,inpartbecausethereiscurrently
little research activity within industry and the business
community to advance the science ofdaylighting with
"advanced" window systems, such as automated blinds
or holographicglazings.

A new approach was devised that combined experimen-
tal measurementswith simulation toolsto produce an
accurate characterization of interior illuminance levels.
Thismethodiscombinedwithanenergysimulation
enginesuch asDOE-2 to produce estimatesofannual
energy usage.The work provided a basis for more flex-
ible daylight modeling tools that can ultimately be used
by conventional engineering consultants.