Good light and bad light: light pollution
The good one acts on mood and improves the state of well-being, the bad one is a real form of pollution.
An imprecise design of outdoor lighting means that a significant fraction of the electricity used for the operation of the systems is sent directly to the sky.
It may seem irrelevant, or at most a waste of energy, in reality it is much more, because it is a form of pollution.
By light pollution we mean any form of irradiation of artificial light directed directly or indirectly towards the celestial vault. To produce it are both the direct emission of light upwards, and the diffusion of a luminous flux reflected from surfaces and objects illuminated with excessive intensity and greater than necessary.
To contain light pollution, it is necessary to illuminate in a rational way, without upward dispersion, using properly designed and assembled systems and fixtures, and dosing the right amount of light according to the actual need, without costly and harmful excesses.
UNESCO, in its Universal Declaration of the Rights of Future Generations, explicitly stated that:
“People of future generations have the right to a free and uncontaminated Earth, including the right to a pure sky.”
The sky as an environmental asset to be protected: this is our responsibility as operators and users of artificial light.