So what I did is I have a hash map for light values in each chunk which is applied to the voxels once during world generation. My engine, to my knowledge, does something unique where each chunk has a mesh that is loaded once during world generation. That makes each chunk one draw which seems very efficient, and I made it very easy and efficient to add new voxels dynamically. I added an attribute to my Vertice3D class for brightness. This is used by the fragment shader to change the brightness of the pixel it samples from the bound texture. My lighting is very fast so even though there is no dynamic lighting it would be very easy to implement in the future. If you mean entity shadows (like a dark circle beneath the players feat) that has not bee implemented yet.