Outdoor light at the entrance and front door In Denmark, there is a big difference in the length of daylight in summer and winter. This means great variation in when the external lighting must be switched on in the morning and evening hours. using sensors and built-in clock functions, smart-house can ensure that outdoor lights are always switched on when they are needed, and at the same time ensure minimal energy consumption as the switch-on periods are continuously adapted to the current light and weather conditions.