For a given wavelength the energy of a photon in inversely proportional to it's wavelength. For a given wavelength we can calculate the energy of photon. Then we can calculate the number of photons of that wavelength that can be produce with 1 Joule of energy and express it in Moles as unit.
Calculator below can be used to estimate max efficiency of a color LED. For PC(phosporus converted) LED enter the wavelength of the blue pump.
Energy of each photon (joules) :
A lamp running at 100% efficiency, producing only the wavelength above will have photometric efficiency of.
E = h × c / λ
h is Planck's constant 6.62607015×10-34m2kg/s
c is the speed of light 299792458 m/s
λ is wavelength of light in meters
mole is 6.02214076×e+23
This calculator is designed for education use only.