Hello Minecraft Speedrunning community! I want to get into speedrunning this game but I had a question about the rules. They state:

Resource Pack Rules

Resource packs are allowed if they clearly and uncontroversially provide no advantage over the built-in resource packs
You must provide a download link for the resource pack you use
If you use a resource pack, please read the detailed resource pack rules at http://bombch.us/DOOK

Please run on vanilla if you do not need a mod to improve your game performance

However in Couriway's latest any% glitchless 1.16 world record, it appears he is using something that enhances the games brightness greatly. This is especially evident at 11:50 where you can see the world turning night time, but the brightness still looks like day time.

So my question is, are fullbright mods allowed? If not, how did Couriway get his game so bright?

Edit: After checking a few more runs I see most people are using some fullbright mod. So I assume it is allowed? It seems a bit like that would give an advantage over pure vanilla which is why I ask.

Edit2: Well I guess I didn't read enough. I missed the part that says "gamma can be set up to 5.0". I initially thought it referred to brightness but realized they are two separate settings.