Centroid wavelength explained

The centroid wavelength is the power-weighted mean wavelength:^[1]

λ _{c} = (1)/(P _{total}) \int p( λ ) λ d λ ,

and the total power is

P _{total} = \int p( λ ) d λ ,

where

p( λ ) is the power spectral density, for example in W/nm.

The above integrals theoretically extend over the entire spectrum, however, it is usually sufficient to perform the integral over the spectrum where the spectral density

p( λ ) is higher than a fraction of its maximum.

See also

• Dominant wavelength

Notes and References

1. Hieda . Keisuke . Maruyama . Tomoyuki . Narusawa . Fumio . 2019-10-04 . The Importance of Centroid Wavelength for the Image Quality Evaluation of Laser Displays . SID Symposium Digest of Technical Papers . en . 50 . S1 . 1002–1004 . 10.1002/sdtp.13724 . 0097-966X.