Java's Dynamic Lighting Add-on 1.21+

Dynamic lighting is one of the most useful features for Minecraft. This feature lets you illuminate your surroundings just by holding a light source or even throwing it on the ground. You won’t have to waste extra resources crafting hundreds of Torches—just one is enough for good lighting at all times. All you need is to use the mod Java's Dynamic Lighting.

Torch lighting in hand

Block lighting on the ground

Lighting a deep pit with a Torch

Miner's Helmet

Switching an item from one hand to the other

Lighting from burning mobs

Lighting from mobs

Lighting from enchanted items

Commands

/scriptevent gao:jdl disable

/scriptevent gao:jdl enable

/scriptevent gao:jdl inc

/scriptevent gao:jdl dec

/scriptevent gao:jdl reset