Directional light looks weird after building

i’m currently making an old japanese dojo scene, and I want a directional light to project light through my wooden window bars. However, when I bake the lighting in my scene, it becomes weirdly warped. Can anyone help me fix this?

Hi!

Your lightmap resolution is low…
To me it looks way too dark but if you liked the first image…

hey man, yeah it is way too dark, but this is just to clearly show the projection of the light. gonna build the rest of the lighting now. Thanks!