old_contents: """Support for Qwikswitch Relays and Dimmers."""
  from __future__ import annotations
  
  from homeassistant.components.light import SUPPORT_BRIGHTNESS, LightEntity
  from homeassistant.core import HomeAssistant
  from homeassistant.helpers.entity_platform import AddEntitiesCallback
  from homeassistant.helpers.typing import ConfigType, DiscoveryInfoType
  
  from . import DOMAIN as QWIKSWITCH, QSToggleEntity
  
  
  async def async_setup_platform(
      hass: HomeAssistant,
      _: ConfigType,
      add_entities: AddEntitiesCallback,
      discovery_info: DiscoveryInfoType | None = None,
  ) -> None:
      """Add lights from the main Qwikswitch component."""
      if discovery_info is None:
          return
  
      qsusb = hass.data[QWIKSWITCH]
      devs = [QSLight(qsid, qsusb) for qsid in discovery_info[QWIKSWITCH]]
      add_entities(devs)
  
  
  class QSLight(QSToggleEntity, LightEntity):
      """Light based on a Qwikswitch relay/dimmer module."""
  
      @property
      def brightness(self):
          """Return the brightness of this light (0-255)."""
          return self.device.value if self.device.is_dimmer else None
  
      @property
      def supported_features(self):
          """Flag supported features."""
          return SUPPORT_BRIGHTNESS if self.device.is_dimmer else 0
  
new_contents: """Support for Qwikswitch Relays and Dimmers."""
  from __future__ import annotations
  
  from homeassistant.components.light import ColorMode, LightEntity
  from homeassistant.core import HomeAssistant
  from homeassistant.helpers.entity_platform import AddEntitiesCallback
  from homeassistant.helpers.typing import ConfigType, DiscoveryInfoType
  
  from . import DOMAIN as QWIKSWITCH, QSToggleEntity
  
  
  async def async_setup_platform(
      hass: HomeAssistant,
      _: ConfigType,
      add_entities: AddEntitiesCallback,
      discovery_info: DiscoveryInfoType | None = None,
  ) -> None:
      """Add lights from the main Qwikswitch component."""
      if discovery_info is None:
          return
  
      qsusb = hass.data[QWIKSWITCH]
      devs = [QSLight(qsid, qsusb) for qsid in discovery_info[QWIKSWITCH]]
      add_entities(devs)
  
  
  class QSLight(QSToggleEntity, LightEntity):
      """Light based on a Qwikswitch relay/dimmer module."""
  
      @property
      def brightness(self):
          """Return the brightness of this light (0-255)."""
          return self.device.value if self.device.is_dimmer else None
  
      @property
      def color_mode(self) -> ColorMode:
          """Return the color mode of the light."""
          return ColorMode.BRIGHTNESS if self.device.is_dimmer else ColorMode.ONOFF
  
      @property
      def supported_color_modes(self) -> set[ColorMode]:
          """Flag supported color modes."""
          return {self.color_mode}
  
subject: Migrate qwikswitch light to color_mode (#70805)