yeah Illuminaria, I knew from your first post when you mentioned "commercial" that I couldn't recommend or give advise for that application, that is just wayyy too deep.
Hopefully if I helped in any way I want recreational and technical divers to see that there are some inexpensive alternatives. Because many, especially tech. divers think that they need to spend $75-$300 for a good backup dive light. And $400-$2,000 for a quality canister light.
I'm just trying to find an alternative, even if means modding a light. Like for example the Ultrafire W200, which I have a simple & inexpensive way to mod that light making it more dependable, plus a little GITD.
stock the W200 is crap - many reports of flickering. So this is only a light to buy if you intend to mod it.
Are there guys out there that currently own this light and it flickers? See my mod here.
with GITD (glow-in-the-dark) o-rings added. Glow lasts about 7 mins. Whenever the light is turned on the o-rings are re-charged 