This is a simple and powerful addon that adds dynamic light for all blocks and items, even with custom light blocks. 

Why should I use this add-on? Great question. It's because this add-on is fully customizable. Other developers can add their compatibility with this add-on with a simple scripting technique. So, in the future, it should be compatible with a bunch of add-ons (I hope so). 

Features

• Dynamic Light
• Offhand item (right click on air while holding an item
• Documentation 

Compatibility

this addon is compatible with Novelty addon by using lanterns in a belt or charm slot it will emit light without holding the items in both hands

Documentation 

You can copy the scripting library from this addon in the folder "scripts/lib/DynamicLightLib.js" The example of code: 

import { DynamicLightLoader } from "./lib/DynamicLightLib.js";

DynamicLightLoader.addItemLight("minecraft:brush", 14);

DynamicLightLoader.addEntityLight("minecraft:cow", 11);

DynamicLightLoader.addEntityEventLight("minecraft:entity_spawned", 15, 100);

You can also use tag format to add custom dynamic light items. format tag you need is like:

dynamic_light:<light level 1-16>

as an example:

{ 
  "format_version": "1.20.80", 
  "minecraft:item": { 
  "description": { 
    "identifier": "example:custom_light_item"
  }, 
  "components": { 
    "minecraft:icon": "brush", 
    "minecraft:tags": { 
    "tags": [ 
        "dynamic_light:10" 
      ] 
    }, 
    "minecraft:max_stack_size":  1 
    } 
  } 
}