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r fullbright

From Quake Wiki

Default value: "0"
Saved to config.cfg: no

r_fullbright is a boolean variable, (1 is on, 0 is off) which turns on or off the precompiled lighting on a map. If you set it to 1, every shadow will disappear and everything will be extremely bright. 99.9% of the time, this is ugly, but this command is sometimes useful if you are creating a map and want to test it without finishing all the lighting, or if you want to "cheat" in an unnecessarily dark level.

Keep in mind that changing r_fullbright in Software Quake has an instantaneous effect, while in GLQuake you will have to restart the level (use the restart console command) for it to have effect.

List of console variables | List of console commands