Light emitter nodes. They can be resized and used as LED lights if small enough. Or you can make less lag with the addition of making a actual thin light strip instead. It would look like a smal plank but with lights hehe. Also could add color options as well, which would emit colored lights! With the new light physics, LED lights will look really great in the game! Imagine putting LED lights in the corners of a room, with the nodes hidden and out of direct sight, imagine how modern that would make your rooms look!