Build command for setting the hue of the led.
        :param hue: Value to set (0.0-1.0).
        :return: The command.

def hue(self, hue):
        """
        Build command for setting the hue of the led.
        :param hue: Value to set (0.0-1.0).
        :return: The command.
        """
        return self._build_command(0x40, self.convert_hue(hue),
                                   select=True, select_command=self.on())