Am 26.11.2016 um 22:31 schrieb Mike Horvath:

>> The third dimension is Y, luminance, aka brightness.
>>
>> It has a lower bound of zero, but no natural upper bound, as light can
>> be arbitrarily bright.
>>
> 
> Illuminant D65 seems to be quite popular. Might that not serve as an
> upper bound?

/Any/ illuminant can serve as an upper limit -- but the question is,
does it make sense in the context? Popularity is not a criterium here.

Unless you have a specific reason for chosing any particular whitepoint,
the only one that stands out is whitepoint E (equal energy).

Another candidate for an upper limit would be Y=1.

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