 red wavelengths the blue wavelengths the green wavelengths all the wavelengths all the colors that you can think of but the actual spectrum of light goes well beyond on either side of that short visible spectrum and ultraviolet light is wavelengths shorter okay so the ultraviolet region starts at about 350 nanometers and goes down to let's say about 200 nanometers and then this project we're particularly interested in deep ultraviolet wavelengths so wavelengths of say