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Here is a method besed on CIE1931 system: \15'~]d
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1) Try to find the intersection point of CIE1931 standrad curve and the following line: q2F`q. j
y=k*(x-0.3333) + 0.3333 &c"!Y)%G
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k=(yo-0.3333)/(xo-0.3333) and (xo,yo) is the known color coordintae point. LH}9&FfjU
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2) the wavelength of the intersection point will be the dominant wave to be determined. ts(u7CJd
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If you need further help, I can share an Excel file. hC8WRxEGq
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Let me know how thing's going. q9_AL8_
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Hope helpful. ZJcX-Z!\
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Mang