LIGHTING DEVICE WITH CONTROL OF POWER FLOW DIRECTION

A lighting device (), comprising a light source () configured to be driven by electrical power, an energy-storage unit () configured to store electrical energy, to receive the electrical power from a power interface and to deliver the electrical power to the light source and to the power interface () allowing, in a connected state, an energy-transfer operation between the energy-storage unit () and an external second energy-storage unit () of an external electrically driven device () that can be connected to the power interface () and a control unit () configured to determine if the power interface () is in the connected state, to determine a current light-output state of the lighting device (), and to control, in the connected state, the energy-transfer operation in an energy-transfer direction depending on the current light-output state of the lighting device ().