Lightmapping - Lightmap Resolution


I am trying to optimize my lightmap but I don’t find a way to reduce the resolution.
There is the Resolution in texel per world unity and the Scale in Lightmap.

Even if I reduce all of this with a single object lightmap, I can’t make it under 1024*1024.

How can I go under this resolution ?

Thanks a lot !

A good way to change your Lightmaps Resolution is to use LightmapEditorSettings in an Editor script.

maxAtlasHeight The maximum height of an individual lightmap texture.
maxAtlasWidth The maximum width of an individual lightmap texture.