more ideas les go. a beam emitter that shoots 3 beams at once, due to special efficiency magic, it only use 2x power instead of 3x, idk if this part might be hard but if possible make it able to do 3 beam prisms. the beam emiter will be .75x the size of the vanilla one
next, double barrel electro turret, 2x fire rate, 1.5x power consumption, think of the flak gun one barel shoots and then the other shoots.
a beam emitter that shoots a beam that is 2x bigger beam than the vanilla one, .75x damage because idk magic!, 1.5x power consumption.
all of this is based off the vanilla counterpart so, i try to make my suggestions somewhat balanced, feel free to change any of the values.