I've actually been working on something similar, feel free to check out my source. It's a block/entity that casts light over everything visible at far render distance(16×16 chunks) Miniaturized, it would be a nice floodlight. Little buggy right now, but once i get the kinks out i'd be happy to share

Hey @fnfalconpunch did you ever get your Block light working lighting everything visible?
In my case i'm not wanting to make lights that would stop mob spawning just make the world brighter so players can see when working.