Monday, December 9, 2013 12:44 a.m. Let’s start out with some definitions: Radiant Flux = F,   units are in Watts (Joules/sec) Irradiance = E, units are F per unit area (W/m^2) Energy of a photon: h*v,     where h = Planck’s Constant and v = Frequency c*/v=lambda       lambda = wavelength, […]