Based somewhat on the Starship Tactical Combat Simulator Design Consortium weapons.
Firing Rate-
Disruptor Missile- 1 per turn
Pulse Torpedo- 1 per 2 turns
Sunbeam- 1 per 2 turns
Power Cost-
Disruptor Missile- 3
Pulse Torpedo- 2+2
Sunbeam- 4
Space in Opt Mounts-
Disruptor Missile- 1
Pulse Torpedo- 1
Sunbeam- 2