Wien radiation law

[2.13.5] An expression representing approximately the spectral radiance of a blackbody as a function of its wavelength and temperature. It is commonly expressed by the formula:

L_{\lambda }=dI_{\lambda}/dA' = c_{1L}\lambda ^{-5}e^{-(c_{2}/\lambda T)}

This formula is accurate to 1% or better for values of λT less than 3,000 micrometer-kelvins.

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