i guess i should have said unless they shoot at fighters? thatís why phaser arrays are great, you can use them for point defense one minute, and then fire off full power shots at larger targets. thereís several instances where phaser arrays were used to fire multiple shots at small targets, high power shots would be wasted on them. but when they are used to deal damage to any other capital ship they fire single full power shots ever time. it certainly isnít that way in game unfortunately.
There's a few other scenes where you see lower-powered shots, but it's usually for "precision" strikes. For example, when the Enterprise wanted to disable the Son'a command ship, they fired two bursts from the ventral array in quick succession. There was no "charge" time on the second shot.