Hey, I'm confused. Am I not formatting this correctly?
Nothing besides the original minecraft:torch & minecraft:glowstone will emit light from the selflight.cfg
Here's how I have it set up

https://pastebin.com/ecnuC8fL

What version of MC is this? If the mods use very complex items with nbt metadata, you may have to add anyNbtMatch for Dynamic Lights to recognize matches. I checked one of your strings, ars_additions:golden_lantern seems to be the correct string to me.

Hey, sorry for the late reply.
I'm on 1.19.2

Try it like this

"{anyNbtMatch:true,lightLevel:15s,nameId:\"ars_additions:golden_lantern\"}",

Sorry for the late response, going to try this soon