The light emitting from modded light sources seems way too dim with the shader on. Rolling back to earlier versions didn't solve the problem.

Specs:

• Arch Linux Kernel Version 6.12.4-arch-1-1
• KDE Plasma 6.2.4 on X11
• 32GB DDR4-3200 RAM (8GB allocated to instance)
• i5-10400f
• RTX 3060

MC specs:

• sodium 0.5.3
• lithium 0.11.2
• indium 1.0.27
• iris 1.6.10

General:

First Person:
Modded light source (MStV+ - More Torch Varients):

Vanilla Light source:

Not a problem or a bug. Solas replaces Minecraft's lighting engine with its own. You need to add modded light sources in blocks.properties

Doesn't fix it.
In fact: If I try any other shader like SEUS, Complementary or Kappa, it just works.

Has to be a bug/issue with Solas imo.