I also use a video light on top of my housing to light my way and function as a focus light. The one I use is 1000 lumens and non-adjustable. I have found that most of the time, even 1000 lumens in a 70 degree beam is still too bright. I am shopping for a replacement that will give me adjustable power levels, so I can run it at a lower power level, and also let me at least switch it to a red beam. I am strongly considering one of the Xtar D30 models, at the moment. I have 4 other Xtar cordless lights and they have been my go-to lights for several years now. Rock solid in that time. And VERY reasonably priced. Well under $100 each, for the ones I have now.
I thought I would want a focus light that turns off momentarily when my strobes flash, but I have found that that feature appears to be completely unnecessary. The strobes are so much brighter that my focus light staying on has no effect on the picture.
Being able to signal is also important, so I also carry a cordless light clipped via a boltsnap to my right chest D-ring. I turn it on and let it just hang down. Pointing down like that, it doesn't have as much effect on critters I'm trying to shoot. And it never points into anyone's face and blinds them. If I want to shine it in a hole or use it to signal a buddy, I normally don't even unclip it. I just grab it and point it where I need to (while using my other hand to point my camera and focus light down), while it it still clipped to me.
I have a really nice canister light (UWLD LD-40), but I have never had an inkling of desire to take it on a night dive where I'm trying to take pictures.