I know NASA has been doing research on how certain light frequencies affect the body but this looks like the kind of pseudoscience thing a marketing team will slap the word "quantum" on to help promote the user's placebo effect.
The linked website thequantlet.com itself states, "The Quantlet is not intended to diagnose, treat, cure or prevent any disease and has not been examined by the FDA or other regulatory agencies..." All of the claims about this device are based on anecdotal evidence as far as I can tell.