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A lightmap is a generated texture applied additively to LightmappedGeneric brush faces to simulate lighting. The color values in the surface's albedo are multiplied by the color values in its lightmap.

Lightmaps are created by VRAD each time a map is compiled. They are static and cannot change, though it is possible to switch lightmap 'pages' on and off (see Naming Lights).

Scale
The lightmap scale of a face defines the resolution of its lightmap. The default scale of 16 makes each lightmap pixel ("luxel") 16 units across, while a lightmap scale of 1 makes one luxel equal one unit. The Hammer Face Edit Dialog is used to change the value per-face.

Lowering scale will make lightmap shadows sharper, but leads to larger map filesize, slightly slower rendering and exponentially slower compiles (that at very low scales start to eat up shocking amounts of system memory).