12/13/2025
More than a decade ago several Tokyo train stations began installing calming blue LED lights on platforms. The idea came from psychological research suggesting that blue light may help reduce stress and promote a sense of calm in crowded public spaces. A study published in Japan examined stations that added blue lighting and recorded a significant decrease in su***de attempts over the following years. The decrease was measured at specific stations and reflects a local effect not a nationwide trend.
Experts say the lights may work by slowing impulsive behavior and improving momentary emotional regulation. Researchers also note that blue lighting is only one small part of larger ongoing prevention strategies which include staff training monitoring systems and social support programs. The findings highlight how environmental design can support public safety when used alongside wider mental health measures.
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