The color gamut information of the light.

def colorgamut(self):
        """The color gamut information of the light."""
        try:
            light_spec = self.controlcapabilities
            gtup = tuple([XYPoint(*x) for x in light_spec['colorgamut']])
            color_gamut = GamutType(*gtup)
        except KeyError:
            color_gamut = None

        return color_gamut