@article{Baker1974RayleighTU,
title={Rayleigh, the unit for light radiance.},
author={Donald J. Baker},
journal={Applied optics},
year={1974},
volume={13 9},
pages={2160-3}
}

A 0.7% accurate formula is derived for the easy conversion of power spectral radiance L(lambda) in W cm(-2) sr(-1) microm(-1)to rayleigh spectral radiance R(lambda) in rayleigh/microm, R(lambda) = 2pilambdaL(lambda) x 10(13), where the wavelength lambda is in microm. The rationale for the rayleigh unit is discussed in terms of a photon rate factor and a solid angle factor. The latter is developed in terms of an equivalence theorem about optical receivers and extended sources, and the concept is… CONTINUE READING