Josh said:

Wow, that really adds to the scene. If I saw that in theaters, I would have felt a little fear. Fantastic.

The only thing I would do is to have the lights flicker a bit before they power down, kinda like an electrical problem. And maybe have a few of those buttons go a little haywire. Perhaps an even more ominous deep boom as the lights come down.

Yeah, we need some subwoofer action. It would be neat to have a bit of rumble like there was when vader would force choke people.