The color of the lights has to do with light refraction / penetration. For the visible spectrum violet, blue and green penetrate further, blue the deepest. If you scuba dive you know that the deeper you go everything starts looking green/blue, but hit it with light and you will see vivid color.
White light contains all colors of the spectrum- not just a concentrated wavelength- so it works but it won't look as bright deeper. I made a green and a blue submersible led light this winter that I plan to use, I'll let you know if one seems to outperform the other.