Adequacy of min-colors thresholds

I have Specified different styling for different display environments.
But do not know whether it is appropriate or sufficient.

What min-colors should I include?  Is it (min-colors 8), (min-colors 16),
and (min-colors 88)?  Would one go beyond 88, and is 8 too uncommon these
days when using emacs?




(defface kronaire-highlight
  '((((class color) (min-colors 88) (background light))
     :background "darkseagreen2")
    (((class color) (min-colors 88) (background dark))
     :background "darkolivegreen")
    (((class color) (min-colors 16) (background light))
     :background "darkseagreen2")
    (((class color) (min-colors 16) (background dark))
     :background "darkolivegreen")
    (((class color) (min-colors 8))
     :background "green" :foreground "black")
    (t :inverse-video t))

  "Basic type face for kronaire display Unit."
  :group 'kronaire-faces)