From the wiki: -samples <N> Enables intelligent antialiasing of shadow edges in lightmaps. A value of 2 both looks good and compiles quickly, while a value of 3 looks great but compiles somewhat more slowly.-samplesize <N> Writes the prescribed samplesize argument to the .srf surface file. The .srf file (and thus -samplesize) affects the -light phase of compile. A lower -samplesize value produces more sharply defined lightmaps. The default samplesize is 16; a samplesize value of 8 produces a blurry, but good quality compile, suitable to call "final" if you aren't looking for extreme detail. A value of 4 produces a more detailed one, but small artifacts may start appearing occasionally. A samplesize value of 1 produces the most possible detailed lightmap, but also creates "stadium lights" artifacts, a much larger BSP file size and lower game performance.Note that the .srf surface file is generated by the -bsp phase of the compile, so -samplesize must be added to the -bsp phase aswell as to the -light phase to make any effect.-super <N> Enables arbitrarily ordered grid supersampling of lightmaps. This is much, much, much slower than -samples, by the way.