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Here is a method besed on CIE1931 system:  7<o;3gR7Kj  
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1) Try to find the intersection point of  CIE1931 standrad curve and the following line: >D4Ez  
  y=k*(x-0.3333) + 0.3333 B]F7t4Y!  
   here l4reG:uYG  
   k=(yo-0.3333)/(xo-0.3333) and (xo,yo) is the known color coordintae point. R./ 6Q1  
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2) the wavelength of the intersection point will be the dominant wave to be determined. kD7(}N8YR  
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If you need further help, I can share an Excel file. `#8R+c=$   
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Let me know how thing's going. azc:C  
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Hope helpful. u`@FA?+E1  
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Mang