For example:
spectra.lch(65, 100, 15).hexcode = '#FF0077'
In R:
hcl(15, 100, 65) = '#F8766D'
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Update:
The problem is that the lch refers to colormath.color_objects.LCHabColor. However in R, the lch function is actually the polar coordinates of the LCHUV color space, which is defined in colormath as colormath.color_objects.LCHuvColor.