The energy performance of lighting is expressed in kWh/m2. This metric represents the annual average electricity demand per unit of illuminated surface. The lower this value; the higher the efficiency of lighting. In 2011 the average electricity consumption per square meter for lighting was 3.2 kWh/m2 ^[1].

The values for the lighting performance are taken from the three scenarios presented in PROGNOS 2012 ^[1] and they define the max and min values for the lighting efficiency slider.

[1] PROGNOS 2012, Die Energieperspektiven für die Schweiz bis 2050, Energienachfrage und Elektrizitätsangebot in der Schweiz 2000–2050.