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Photonics Dictionary

Planck's (radiation) law

The formula describing the spectral radiant emittance of a perfect blackbody as a function of its temperature and the wavelength of the emitted radiation.

where Wλ equals radiation emitted into a hemisphere, C1 equals 3.7405 x 104, λ is wavelength (µm), e equals 2.7183, C2 equals 1.4388 x 104 and T is temperature in kelvin.
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