Ray wrote that both orange and red light have beneficial effects:
http://www.newscientist.com/article/dn2 ... 8Rk6I1dUmk
http://www.nature.com/nature/journal/v5 ... 7276b.html
http://www.newscientist.com/article/dn2 ... 8Rk6I1dUmk
http://www.nature.com/nature/journal/v5 ... 7276b.html