Abstract: An outdoor lighting device for lighting a target, particularly for use in street lighting, includes a support structure and a lighting unit stably associated with the support structure and having one or more light beam sources of LED type, with preset FWHM values, and one or more reflecting surfaces designed to at least partially reflect light beams. At least a first one of the LED sources has the FWHM of its luminous spectrum totally reflected by one or more of the reflecting surfaces and totally projected towards the target for increased lighting efficiency.