Abstract: Design by a consumer of a lighting plan for illuminating a space is facilitated. An electronic display is provided of a room showing a plurality of areas thereof. Selection by the consumer of any one from among the plurality of areas is enabled, and then selection by the consumer of any one from among a plurality of lighting arrangements available for illuminating the selected area is enabled. The consumer is enabled to repeat the area selection and lighting arrangement selection for all of the plurality of areas. The room is displayed as illuminated by the combined effect of illuminating all of the plurality of areas with the lighting arrangements respectively selected therefor, so that the overall effect of the combination of lighting arrangements in all the areas of the room is simulated as realistically as possible. The consumer can thus find the best overall lighting plan.