Brightness Matching/Additivity Failure

Please be aware that due to the color graphic limitations of computer graphics and monitors it is very difficult to make exact representations of how colors will appear in an optical system.  But this graphic does give a clear idea of the results of additivity failures in heterochromatic bright brightness matching.   If the top two fields were red + white and green + white and they were then superimposed the bottom field would be yellow and white.  The yellow would be less bright than the white even though the top two color fields were matched in brightness to the white reference field. 
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