

In emergency cases most holograms can be shut off to match increased energy demands by weapons and shields.
Disengage the safety protocols and suddenly you’ve got weapons and shield emitters than ought to work just as well as their material counterparts, but can’t be damaged (or any damage can be instantly reset). We know that holograms can be projected into space so the only limitation would be the range of the holoemitters.
A standard reference model in 3d modeling.
https://en.wikipedia.org/wiki/Utah_teapot