Lighting, a main focus of Swiss energy efficiency policy, is a substantial consumer of energy in the residential sector in Switzerland, requiring 4.1 PJ electricity in 2015 or 6.4% of the sector's total electricitydemand. Currently, incandescent bulbs (sales were prohibited in 2014) and halogen bulbs (to be bannedin 2018) jointly represent nearly 60% of the installed lighting capacity in Swiss households. In the pastfew years, the price of light emitting diodes (LEDs) dropped dramatically, offering largely unexploitedopportunities for energy efficiency improvement. To assess the energy efficiency potential in householdlighting, a dynamic model is developed that accounts for the change of the lighting stock per technologyover time.