Here's another couple 'o tips.
1) aim the light
toward the audience as much as is safe - this will make the beams appear brighter because light coming
through dust/fog is brighter than light
reflecting off of dust/fog
2) Get a proper
front surface mirror. Instead of having the silvered part behind glass, these have the silvered part
in front of the glass. This gives a much better return on investment, brightness-wise, because there's no secondary reflection from the glass. The CD in the video will also act as a diffraction grating, which gives you tunnels within tunnels - but all of them put together will be less bright than if you only had one beam from a first surface mirror.
3) Go to a plastic supply co., and pick up some different scraps of bubble glass, and check out what those look like, for another effect. (search web for 'lumia effect').
- Hook