Sources' Spectra, Roadway Surfaces and the Potential for Uplight Scattering

For this discussion, light can be modeled as photons, each associated with a one frequency 1 . A photon's associated energy content can be determined using Plank's constant. Therefore, at a given wavelength (which is inversely related to frequency), every photon has the same energy content, but they differ from those at any other wavelength. For equal amounts of radiant energy at different wavelengths, there are more photons associated with the longer wavelengths, but each of those photons has a lower energy content 2 .