Yeah usually no crowd scanning. Another HUGE factor for lasers in clubs is the haze. Clubs theatres etc use hazers, not fog machines. the smoke particles in a hazer are alot less dense than fog machine ones, so you get a good amount of haze in the air. I found even the 40mw green in my RGY was enough for a big hall, and we used a hazer. THey make a big difference it the appearence.