-dscale does not scale the lightmap resolution, SourceSkyBoxer, it scales the direct lighting brightness, using -dscale 0.1 will just make your map super dark.

The problem here is a combination of a low lightmap scale (unavoidable) and texlights, which emit several point lights each.

A way of fixing it would to be to use a single spotlight, or point light, apart from that, there's not much you can do.

edit: whoops, bit late.