Convert watts to photon counts at a given wavelength.

Inverse of photon2W.

Usage

W2photon(W, lambda)

Arguments

W

Spectral irradiance in \(W\,m^{-2}\,nm^{-1}\).

lambda

Wavelength(s) in nm.

Value

Numeric vector of photon counts in \(photons\,m^{-2}\,s^{-1}\,nm^{-1}\).

Examples

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