code: def white(self, kelvin):
      
      whiteness = int(((kelvin - MIN_KELVIN) * 255)/(MAX_KELVIN-MIN_KELVIN))
      whiteness = max(min(whiteness,255),0)
      data = [CODE_COLOUR, self._id, 255 - whiteness, whiteness]
      self._mode = MODE_WHITE
      self._white = kelvin
      self._effect = ''
      self._send(data)
docs: Supports between 2700K and 6500K white
      :type kelvin int: