What is lighmap resolution for a landscape component?

Hello guys,
I’m struggling to reduce the size of my map. Until now, I’ve

  • shrinked down all possible lightmap size
  • overridden lightmap size for far away objects
  • deleted all hidden components for the landscape

but the size of my scene is still around 260Mb. I’ve 968 Lightmaps in scene, 482 actors and a landscape 140 components, of size 2551x3571 (after deleting components, I started from a 4033x4033 landscape). Even changing landscape lightmap resolution to 0.5 doesn’t affect memory that much.
So now, what is exactly the size of a lightmap for a landscape component? There is a way to directly affect it?

Thanks!

-Peace-
Budello

Live news: putting 0.25 in “Static lighting resolution” drop file size to 190Mb. I’d almost no change putting 0.5, but obviously baking quality is really low on terrain. Any suggestion?