The Light card allows you to change the brightness of the light.
Screenshot of the Light card.
To add the Light card to your user interface, click the Lovelace menu (three dots at the top right of the screen) and then Edit Dashboard. Click the plus button in the bottom right corner and select Light from the card picker. All options for this card can be configured via the user interface.
Alternatively, the card can be configured using YAML:
type: light entity: light.bedroom
Action taken on card tap and hold. See action documentation.
Action taken on card double tap. See action documentation.
Overwriting names example:
type: light entity: light.bedroom name: Kids Bedroom
type: light entity: light.office name: My Office
Screenshot of the Light card names.