Actually I do not sure whether it is a rendering issue and I installed Optifine. But I think it should be fixed.

Also, its collision box is as large as a full block when you try to break it, it is different from what you can see when you point at the light, and this has made a lot of trouble for me.

I'm using Java8 and latest release of AutoReglib and Psi(1.12.2).

Well....can you see this? Or this mod has been abandoned?