old_contents: """Support for LightwaveRF lights."""
  from __future__ import annotations
  
  from homeassistant.components.light import (
      ATTR_BRIGHTNESS,
      SUPPORT_BRIGHTNESS,
      LightEntity,
  )
  from homeassistant.const import CONF_NAME
  from homeassistant.core import HomeAssistant
  from homeassistant.helpers.entity_platform import AddEntitiesCallback
  from homeassistant.helpers.typing import ConfigType, DiscoveryInfoType
  
  from . import LIGHTWAVE_LINK
  
  MAX_BRIGHTNESS = 255
  
  
  async def async_setup_platform(
      hass: HomeAssistant,
      config: ConfigType,
      async_add_entities: AddEntitiesCallback,
      discovery_info: DiscoveryInfoType | None = None,
  ) -> None:
      """Find and return LightWave lights."""
      if not discovery_info:
          return
  
      lights = []
      lwlink = hass.data[LIGHTWAVE_LINK]
  
      for device_id, device_config in discovery_info.items():
          name = device_config[CONF_NAME]
          lights.append(LWRFLight(name, device_id, lwlink))
  
      async_add_entities(lights)
  
  
  class LWRFLight(LightEntity):
      """Representation of a LightWaveRF light."""
  
      _attr_supported_features = SUPPORT_BRIGHTNESS
      _attr_should_poll = False
  
      def __init__(self, name, device_id, lwlink):
          """Initialize LWRFLight entity."""
          self._attr_name = name
          self._device_id = device_id
          self._attr_brightness = MAX_BRIGHTNESS
          self._lwlink = lwlink
  
      async def async_turn_on(self, **kwargs):
          """Turn the LightWave light on."""
          self._attr_is_on = True
  
          if ATTR_BRIGHTNESS in kwargs:
              self._attr_brightness = kwargs[ATTR_BRIGHTNESS]
  
          if self._attr_brightness != MAX_BRIGHTNESS:
              self._lwlink.turn_on_with_brightness(
                  self._device_id, self._attr_name, self._attr_brightness
              )
          else:
              self._lwlink.turn_on_light(self._device_id, self._attr_name)
  
          self.async_write_ha_state()
  
      async def async_turn_off(self, **kwargs):
          """Turn the LightWave light off."""
          self._attr_is_on = False
          self._lwlink.turn_off(self._device_id, self._attr_name)
          self.async_write_ha_state()
  
new_contents: """Support for LightwaveRF lights."""
  from __future__ import annotations
  
  from homeassistant.components.light import ATTR_BRIGHTNESS, ColorMode, LightEntity
  from homeassistant.const import CONF_NAME
  from homeassistant.core import HomeAssistant
  from homeassistant.helpers.entity_platform import AddEntitiesCallback
  from homeassistant.helpers.typing import ConfigType, DiscoveryInfoType
  
  from . import LIGHTWAVE_LINK
  
  MAX_BRIGHTNESS = 255
  
  
  async def async_setup_platform(
      hass: HomeAssistant,
      config: ConfigType,
      async_add_entities: AddEntitiesCallback,
      discovery_info: DiscoveryInfoType | None = None,
  ) -> None:
      """Find and return LightWave lights."""
      if not discovery_info:
          return
  
      lights = []
      lwlink = hass.data[LIGHTWAVE_LINK]
  
      for device_id, device_config in discovery_info.items():
          name = device_config[CONF_NAME]
          lights.append(LWRFLight(name, device_id, lwlink))
  
      async_add_entities(lights)
  
  
  class LWRFLight(LightEntity):
      """Representation of a LightWaveRF light."""
  
      _attr_color_mode = ColorMode.BRIGHTNESS
      _attr_supported_color_modes = {ColorMode.BRIGHTNESS}
      _attr_should_poll = False
  
      def __init__(self, name, device_id, lwlink):
          """Initialize LWRFLight entity."""
          self._attr_name = name
          self._device_id = device_id
          self._attr_brightness = MAX_BRIGHTNESS
          self._lwlink = lwlink
  
      async def async_turn_on(self, **kwargs):
          """Turn the LightWave light on."""
          self._attr_is_on = True
  
          if ATTR_BRIGHTNESS in kwargs:
              self._attr_brightness = kwargs[ATTR_BRIGHTNESS]
  
          if self._attr_brightness != MAX_BRIGHTNESS:
              self._lwlink.turn_on_with_brightness(
                  self._device_id, self._attr_name, self._attr_brightness
              )
          else:
              self._lwlink.turn_on_light(self._device_id, self._attr_name)
  
          self.async_write_ha_state()
  
      async def async_turn_off(self, **kwargs):
          """Turn the LightWave light off."""
          self._attr_is_on = False
          self._lwlink.turn_off(self._device_id, self._attr_name)
          self.async_write_ha_state()
  
subject: Migrate lightwave light to ColorMode (#70849)