The invention relates to the integration of an energy function into a light management system, particularly for saving energy and monitoring energy consumption. According to an embodiment of the invention, a light management system (10) with an integrated energy function is provided, wherein the system is adapted to receiving energy information about light fixtures (12-16) of a lighting system (18), and to processing the received energy information with regard to energy consumption of the lighting system (18). The energy function may be for example used to automatically configure a lighting system to low energy consumption, to allow further configurations of the lighting system with regard to lowering energy consumption, or to provide a user with a sensible set of lights that can be turned off and will amount to significant energy savings when turned off.