Let's clear up a bit of misunderstanding about PHOTONS. These minuscule particles, and they are particles albeit small in stature, possess MASS! If we look at the idea that they have an energy component (which is hardly controversial) then we also understand that mass in motion has a momentum as well as energy per NEWTON (as well as Einstein and others of some renowned). The human eye as well as those of other creatures with vision capabilities see an ENERGY LEVEL, NOT COLOR!! PHOTONS don;t have a color, nor a vibration, nor an oscillation, nor a wavelength. They are simply bits of fast moving matter with a kinetic energy.