The qualitative lighting design focuses on good orientation and a bright spatial impression. The differentiation into reception, table, stairway and wall zones supports readability and therefore improves orientation. Various types of luminaires with wallwashers, double-focus downlights and downlights with oval flood provide optimum light distribution in each case.
The quantitative lighting design of a foyer aims at achieving minimum illuminance. Functional requirements specify a large circulation area and the zone with the reception below the gallery. Downlights generate uniform brightness as well as striking light cones on the walls. The upper wall area appears dark.
With qualitative lighting design the floor plan specified zones: wallwashers opposite the entrance, downlights with oval flood light distribution for the gallery and double-focus downlights for the waiting area.
With the quantitative lighting design a uniform pattern of wide distribution downlights is installed across the ceiling.
The differentiated lighting tools used in the qualitative lighting design enable higher efficiency. The number of luminaires and connected load are economically superior to the quantitative lighting design. The result is lower energy requirements per area.