Dim LEDs and quiet buzzers

Ok, here's rough circuit diagram.
There isn't much description on the buzzer (or speaker or whatever), as I found and hacked a little red gizmo my uncle had (looked like one of those "easy" buttons you'd push. Same with the dial indicator, I stole it from junk pile at work. It was intended to monitor difference in amperage on a 3-phase circuit originally.

My question isn't a what's wrong with the circuit as much as what better stuff is out there I could buy? The LEDs are working correctly, and the buzzer is... buzzing when required.

My question is - if you've seen the movie, I really need something as bright as a 120VAC incandescent bulb but could still run off the 3-5 Volts on the board. Is there a 3V bulb that screws into standard light bulb plug? Best I can tell standard lightbulb thread is E26, and I found some on google, but not sure the board can supply amps needed.

Same with the buzzer - I need loudest possible that I could drive from the board. The one I have is just not real loud, and I have little info on it. There is a small green board inside the thing, has a few resistors on the board, or something that looks like resistors. My soldered connections are so precarious I'd rather not take it apart again, and that's kind of beside the point anyways. I want to know what's going to be loud. Again, I've found some low VDC solutions, but not sure the board can drive them..

Power source is USB cable from a wall outlet into the mini-USB jack on the board.