Prevents all light-emitting surfaces from automatically being made fully bright. This can be useful when mapping for a modern Quake2 engine modification that features more realistic texture-based fullbrights.

Qrad3 creates "transfers" to track light sent between patches. The amount of light is based on many factors, including distance and relative surface angles. This option sets a minimum cutoff level, reducing the number of transfers, which decreases compile time and memory requirements. Note: the changes to the bounced light appearance can be somewhat unpredictable. Tiny decimal values (<= .01) tend to look best.

Sets the minimum brightness cutoff for all special (non-0) lightstyles (normal lighting is unaffected). If their light falls below this brightness level, it will simply not be added to the lightmaps.