Convert watts to photon counts at a given wavelength.

Inverse of photon2W.

Usage

W2photon(W, lambda)

Arguments

W

Spectral irradiance in W/m^2/nm.

lambda

Wavelength(s) in nm.

Value

Numeric vector of photon counts per second per m^2 per nm.

Examples

W2photon(1, 555)
#> [1] 2.793935e+18