Couple of good points in here, including the figure 8 ring, which is advocated, last I knew, by Clint Smith.
Couple of SCARY Things also. Here's a couple of concepts to keep in mind:
1. if you are moving/fighting, you don't want your light in constant on mode, so you need to hold it with your hand so it can be turned on and off.
2. When you "stash" it somewhere, you want to keep in mind a few things:
A. using a movement close to what you would normally do when you reach for a fresh mag (ie- towards belt, not mouth).
B. Kept in a place that doesn't compromise your ability to fight or compromise your strong arm.
C. you are already adding extra movement, so minimize it.
-RJP