Most people are aware of that ultra-violet rays have an effect on people. But did you know that the visible color spectrum has therapeutic effects? The effect is based on the physics of light. Each color has a specific wavelength and wave frequency. For example, violet light has a calming effect. Orange has an uplifting effect for people with depression. Red has a stimulating effect. Magenta has a emotional balancing effect. There are many other examples for uses of color light in improving treatment results.
A lamp can be used to shine the light onto the person or a probes with light at the end can be shone onto acu-points to enhance effects. I have personally observed better treatment results when I add color light to my treatments.