Blue lights on train platform

(Saw this in a variety show last night)

In Tokyo train stations, you may have come across blue street lamps on some open platforms. These are said to help discourage people from committing suicides on the tracks. Since these lights have been set up, suicides rates on these tracks have been estimated to drop by as much as 80%.
Blue lights are claimed to have a calming effect on people. In some parks, blue lights are used to discourage crimes too.