Static Meshes get lit by outside light in closed BSP room

Hello. I have a problem about my static mesh boxes that get lighting from outside directional light in a closed room. The room is a hollowed static BSP box. Static meshes are not movable and converted to static mesh from BSP boxes (because performance was awful while working as bsp).

I think there’s a lightmap error but I don’t know how to fix it. This room must be completely in dark and lit only by spotlights. Any ideas?


might be uv or occlusion issue try add reflection capture sphere inside bsp box try add mesh that you are sure have correct uvs

EDIT: add lightmass importance volume as well

ok I have lightmass importance but not spheres. I’ll try that thanks.