Though these F/X are use more often in single player maps where visuals are very important, they should be use sparingly in MP.
These can potential put a hit on processing during game play.
Use them advisedly.
I may add a more detailed tutorial on the use of these specifically at a later date. If we find the time.
Use them advisedly?
If you want to use clientFX lights I can only suggest that you use them wisely, these lights give a hit to processing in game. Use then in smaller confined areas with less polies and don't overlapp 3-4 similar effects in the same area. It may look great but slower machine user will curse you.