Describe the bug
Everything around me is dark, and even glowstone dosent produce any light.

To Reproduce
Steps to reproduce the behavior: Close the game and start it again.

Screenshots
https://user-images.githubusercontent.com/65219829/83938869-99015f80-a7d8-11ea-98de-c74f7bdd8848.PNG

Info (please complete the following information):

• Modpack Version: 2.6
• Server or Singleplayer: Singleplayer
• Version the world was created on: 2.6

Additional context
I believe some mod caused the lighting issue.

This is a super old version, try updating and see if it fixes it?

Also, are you using any shaders?

2.6 may as well be ancient history now.