Introduced in Minecraft 1.17, light blocks are invisible items that produce light levels ranging from zero to 15.

You can only get light blocks via the /give command so, er, don't expect to go mining for light. (If you need more details on Minecraft console commands, you can follow that link.) ...

You can get a command block in your Minecraft Java or Bedrock world using cheats and a special chat command.

Players interested in automating their commands in Minecraft will have to use Command Blocks, but they’ll need to update their settings to add them into the game.