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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?

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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.