When I learned about this story and saw the pictures of Grace's healing, I was interested in finding a way to incorporate Dinshah's fundamentals with present day frequency therapy. Colors in light are frequencies in hundreds of trillions hertz or cycles per second varying within a range according to the color. In music, there are several notes which also are frequency. Each note has a harmonic note in a higher or lower octave. Therefore, on the piano there are several C notes in the different octaves that are in tune with each other or cause a harmonic interaction with every other C note.
Harmonics also depend on the shape of the wave itself.
Light is also in harmonics of two's and the bioenergy also is enhanced the best by harmonics of two's. With this in mind, Dinshah's fundamentals of high frequency color light could be used in lower harmonics frequencies having a similar effect. Now you may asking why not just use color light. The problem relates to technological pollution of electromagnetic fields and inconvenience of the therapy itself, which required an hour twice a day at certain times of the day according to geographical location with the area of concern to be exposed. In Dinshah's time there was much less electromagnetic interference with the light wave and its interaction with bioenergy making it more efficient.