Talk:Centre wavelength
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Definition
[edit]The current definition is wrong. It is rather the definition of the centroid wavelength. This may caused by using Symbol λc instead of λ0.5m.
Correct definition of center wavelength:
The center wavelength is the wavelength halfway between the two points with a spectral density of 50% of the peak.<ref>http://spie.org/x32417.xml</ref>
λ0.5m= (λ'0.5m+ λ"0.5m) / 2
To avoid confusion it would be helpful to have reference to the following definitions as well:
λc Centroid Wavelength
λ0.5m Center Wavelength
λp Peak Wavelength
Central Wavelength
Further sources for definitions of Center and Centroid Wavelength:
[1] Field Guide to Illumination
A. V. Arecchi, T. Messadi, and R. J. Koshel, Field Guide to Illumination, SPIE Press, Bellingham, WA (2007)
[2] Handbook of LED Metrology
Instrument Systems, 42 Pages, 2009-09-10
http://www.instrumentsystems.com/fileadmin/editors/downloads/Products/LED_Handbook_e.pdf
[3] Symbols & Terminology
Document Number: 81252, Rev. 1.3, 18-Aug-08, VISHAY Semiconductors
http://www.vishay.com/docs/81252/symbols.pdf
[4] The Radiometry of Light Emitting Diodes
Labsphere, Inc., 18 Pages, 2001-01-03
http://www.bfioptilas.com/objects/52_23_2079453411/LED-Measurement-Guide.pdf
[5] Answers(TM)
http://www.answers.com/topic/spectral-centroid