From what I read from it, it is driven by the "fear of the dark" in a lot of cases. Also, what could prevent us to have lights that are turned of when there is

From what I read from it, it is driven by the "fear of the dark" in a lot of cases. Also, what could prevent us to have lights that are turned of when there is no-one around and for the other cases, have our own source of light (like for example... a mobile phone or a head-light) ? Big optimization.