Discussion
The lightness function L star is identical in CIELAB and CIELUV, being based on
Answer: C
Correct answer: the cube root of the luminance factor relative to white
\[ L^* = 116\left(\frac{Y}{Y_n}\right)^{1/3} - 16, \] with a linear segment near black to avoid the infinite slope there. The two spaces share this function exactly, so a colour has the same lightness in both and they differ only in how they treat chromaticity.
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