Two to three large blue flashes, freeze seven boys in their tracks

At around 19:00 hours in 1978 or 1979, seven boys witnessed two to three large blue tinted flashes in Palos Verdes.  This was on the corner of Elmbridge Drive and Browndeer Lane.  
Parents were inside a  home there at a dinner party.  We thought one of them had played a trick on us, but none were around.  The color was similar to some police car lights.  No sounds once this happened in air or in street.  Was a still night.  No breeze. No sound from air, or street.  We had seen the Good Year Blimp many times in the area over the years but this was not it.  
The two or three bluish lights or flashes, all encompassing flashes, seemed to illuminate the whole street and side of houses and trees across Browndeer lane.  Silent flashes like an electrical event but no clouds or wind.  No power lines either in this area.  We all froze for five seconds or so.
Witness indicates that the date is approximate.  PD