Area Lights adds a face-based lighting workflow to Blender. With an object selected, you switch to edit mode, select the faces you want to turn into area lights, then open the N panel, find the lights section, and click the button to create them.
The add-on comes from Anthony Aragues and is a Dev Fund Contributor, with money going to the Blender development fund. It carries a GPL license and can also be found on GitHub. Documentation is included, a demo video is available, and the listing records more than 50 sales.
Area Lights is built for Blender versions 2.82, 2.83, 2.9, and 2.91, and the developer notes it is in need of updating for later releases. If you work in one of the supported versions, it offers a direct way to turn mesh faces into area lights from your existing selection.