What blue street lights are for
Some areas not only in Scotland, but also in Japan and other countries, have decided to replace common lighting with blue night lights.
The areas in question have seen a decrease in the number of suicides by 84%, and in miscellaneous crimes by 9%.
Blue lights, being cold lights, have an antidepressant effect similar to that of sunlight.
In Japan, it is mainly train stations and bridges (for obvious reasons) that are illuminated in this way.
Blue lights are also often used in club bathrooms to prevent you from using heroin. In fact, it seems that with this type of light it is more difficult to see the veins in the arm and therefore to inject substances.