1k Sound and light 

Sound and light are just two known manifestations of the universal energy, and they could each be either harmful or helpful. I know practitioners that combine sound healing and color therapy. These practitioners are looking for the "color" in bowls.

Even if you try to convert the units of sound (Hertz, Hz) to units of light (Nanometers, Nm), you are not doing any kind of alchemy. Frequencies of the audible sound and light are drastically different and situated far apart on the frequency spectrum, so the Hz sound values can not be converted into Nm of light.

If you are interested in discovering more about light therapy, I strongly recommend the "Spectro Chrome" encyclopedia by Dinshah Ghadiali.

I also would like to add that during my research on color therapy and energy centers (aka chakras), I’ve found no evidence of the relationship between seven colors of light and the seven main chakras.

Each chemical element has its own spectrum of atomic emission.    Dinshah's theory describes the principle of color therapy as a projection of the desired color toward the exposed part of the body that needs therapeutic attention. The color is being chosen is based upon the lack of particular chemical elements in the client's body.

Dinshah designed a special machine called “Spectro Chrome Projector” which is equipped with an incandescent bulb, optical condenser, and most importantly, five color filters covering a very precise spectral range of wavelengths. Twelve different combinations of colors are available by setting these filters separately or in a band of pairs.