Google "definition of white light" and you get... "white light
Noun: 1) Apparently colorless light, such as ordinary daylight. It contains all the wavelengths of the visible spectrum at equal intensity. 2) The light supposedly seen by people as they approach death."
Reread that. Below are just random thoughts that are not so random to a learned mind (some physics helps)
This is very cool to me since I adhere to the belief that imagining working with white light (entering it into you - in-spiration - or inspire, & breathe in) take this "white light" INTO you, I suggest the vast amount of space in your atoms. Use the purest source in the universe and piggy back it on white light to purify yourself. The closest light source is the sun I believe.