This it's the configuration that I've added on the .sc file of one of the planet's moon where I'm trying to make the city lights.
I've put the files in addons/textures/planets/xurama/lights-hd
GlowMap "Xurama/Lights-HD"
GlowTileSize 256
GlowTileBorder 1
GlowMode "Night"
GlowColor (0.20 0.40 1.00)
GlowBright 1.0
I also leave the light and surface map below.