Variation in daylight correlation coefficient as blind angle is varied for a) summer direct lighting conditions, b) summer
diffuse lighting conditions,c) winterdirectlighting conditions,d)winter diffuse lightingconditions

The "gain" of a typical closed-loopproportional systemvarieswiththespatial distributionof daylightin a space. This critical parameter is setonceupon the daylighting controlsystem's installation thenleftto controlthe lightingforall
electric and daylighting conditions within the space overthe entire year.Occupants will complain and even sabotage
the system ifthelights are toodim--a resultofimpropercommissioning.Weshow above how this gain parameter
varies with venetian blind angle and solar condition.