.Street Lighting is one of the major lighting circuits in terms of load in any country and the potential for saving is quite high since this needs to be used every day during the night hours.  It is universally agreed that the lighting level need not be uniform throughout the night. The requirement of illumination during peak hours will be more and the same can be reduced during late night. A device for automatic late night dimming will reduce the energy consumption by up to even 50% for the selected duration.