Color computations were limited to illuminants A, D65 and C up to now. Additional illuminants could be imported and used for computations – however, this option was somewhat hidden and very likely overseen by many users.
With have now, starting with object generation 4.86, implemented 15 additional illuminants (D50, D55, D75, F1, F2, F3, F4, F5, F6, F7, F8, F9, F10, F11, F12).