centroid wavelength

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[4.7.2] λ_c

The wavelength at the weighted center of the spectrum of a monochromatic device under test (DUT); this is the weighted average of each wavelength and is defined by:

\lambda _{c}= \left [ \int_{\lambda _1}^{\lambda _2}\lambda \cdot S\left ( \lambda \right)d\lambda \right ]/\left [ \int_{\lambda _1}^{\lambda _2} S\left ( \lambda \right )d\lambda \right ],

where λ is the wavelength and S(λ) is the spectral power distribution of the monochromatic DUT.

NOTE: This term was added in RP-16-17 Addendum 1.

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