yeah the light effect at the top explosion is probably just the light flare particle. not the light engine light.
difference (on this shot): the light engine light (bottom) is brighter. you can clearly see the difference between those two if you watch closely.
in some cases the light engine light might not be visible because the explosion is created directly in the wall.
who the f*ck cares anyway? those explosions are visible for less than a sec.
you should add a cmd which kicks player from server if he turned off shadows... because this player can get advantage, eg: guy with turned ON shadows go in dark place and camping here, but guy with turned OFF shadows can easily check where is he.
i'm sorry for posting this in wrong thread.