reduction of the energy consumption and (indirectly) of the fuel consumption and emission of CO2, NO4, SO2 and other molecules
protection of the natural overnight environment, reducing the disruption of the natural ecosystems (animals, plants and ecological processes) and the protection of the night birds.
avoid glare of the aircrafts and ships.
avoid disturbing the neighbors.
development of astronomy, both professional and amateur.
dark sky preservation in accordance with the UNESCO declaration on the rights of future generations:"the night sky, with its beautiful stars and its message of our place in the Universe, a precious treasure of all humanity and an heritage belonging to all of humanity to be preserved, visible and clean, to the actual and future generations"
