I'm not sure you should worry about a dive light being too bright! You are usually trying to overcome murky water or adding full spectrum light to the seascape that has had the reds and other longer wave lengths of light already filtered out. If you just need to illuminate guages or gear, that's one thing but if you want to reach out or illuminate your surrounds, that's another issue.
Have you considered a LC100? /ubbthreads/images/graemlins/grin.gif
- Don