Blue-colored Light To Decrease The Danger

An intriguing anecdotal finding was recently reported by some news outlets. It is believed that the implementation of blue-colored streetlights has reduced both crime and suicides.

Glasgow (Scotland) introduced blue street lighting to improve the city’s landscape in 2000. Afterward, the number of crimes in areas illuminated in blue noticeably decreased.

Nara (Japan) prefectures police set up blue streetlights in 2005 and found the number of crimes decreased by 9% in blue-illuminated neighborhoods. Many other areas nationwide have followed suit.

Keihin Electric Express Railway Company changed the color of eight lights on the ends of platforms at Gumyoji Station in Yokohama (Japan) in February.
Since the railway company introduced the new blue lights they’ve had no suicide attempts.

This effect may be attributed to a few possible reasons:

  • The light color is new and unusual, causing people to act more cautiously in the area (as a person is unsure what to expect in the unusually-lit area).
  • Blue is a light color almost universally associated with a police presence, suggesting it is an area of stricter law enforcement.
  • Blue may be a more pleasant illuminating color to most people. As it is considered to be opposite to yellow, orange, or red according to some research (such as Lewinski, 1938).

    • The article quotes from a professor at the end, noting it may just be an “usualness effect”:
    Prof. Tsuneo Suzuki at Keio University said: “There are several pieces of data to prove blue has a calming effect upon people. However, it’s an unusual color for lighting, so people may just feel like avoiding standing out by committing crimes or suicide under such unusual illumination. It’s a little risky to believe that the color of lighting can prevent anything”.

    There is a lot of research into the psychology of color, but not as much as looked into the color of blue illumination itself (as opposed to the color of an object or wall). But some research looking into short wavelength light (blue) has demonstrated that it is a potentially effective treatment for seasonal affective disorder (a seasonal type of depression; see for instance, Glickman, et al., 2006), and helps to reduce stress response in fish (it hasn’t been yet tested on humans).

    If this finding is robust and the behavior change associated with it is still prevalent a few years from now (when everyone has become accustomed to the new light color), it would be an interesting finding. A simple, inexpensive change might be effective in helping reduce at least one method of suicide (and reduce crime to boot).

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