It sounds like a New Age hype, but this concept is known for ages, and since it is still in the open, we should be curious. Does anyone have experiences with it?
Edited after E 99's answer:
For all those who do not want to google what I mean, I copied a text, which will explain it and save you time....: Along with colors, light also consists of chemical and emotional elements since it emits heat, electricity and magnetism. Thus, light, along with its component colors, can be used for healing the mind, body and spirit. This is the basic principle behind Chromotherapy or color therapy. Different colors have different effects on the mind and body.
I believe in the power of the mind. How and what we feel, and why, can be influenced by effective interface with the brain, subconscious or otherwise. A condition familiar to most every culture and confirmed by medical science.
What we believe holds a great sway over everything we are and do, whether we are aware of it or not. I am willing to accept there are many things I/we do not fully understand about how it all works, but I withhold judgement in lieu of evidence.