It is known that site’s perception changes during days and seasons. If observed with attention, places look always different, landscape is never the same. Mostly because of weather and of lighting variations, which often reveal unknown details, specific elements of reality usually unseen. Uncontrolled use of electric lighting levels differences, causing lighting pollution that falsifies historic centers and landscapes, this because of excessive lights and of fanciful designing lights often not coherent with context. New generation of lighting technologies bring to unexplored fields and to new spatial experimentations, in which is possible to join needs of visibility and safety to free use of parks and public spaces during evening times and to energetic efficiency and environmental respect. Is possible to design site’s lighting starting from its specific characters, giving importance to its specific qualities and to variations of light and shadow on it. Led lights, lighting volumes and interactive elements, between installations site-specific are used to set up perceptual experiences, to reinvent a place, and to join design approach to most advanced environmental art experiences.