I'm in the market for a focus light as well. Presently I use an I-Torch Video Pro 3, but the threads are wearing out on the body section at the back end despite my slightly OCD-ish attempts at cleaning and lubing. I've looked (over the internet) at lots of lights - mainly at specs, and find that most lights sold as focus lights also do double-duty - given enough intensity, as video lights. In my mind, providing a little light so a lens can focus - usually a macro lens, and illuminating a scene for video are two entirely different propositions! Regardless, I recently tried my wife's I-Torch Fish Lite 24 and found the wide beam angle (110 degrees) very distracting and annoying. Even in the relatively low vis of our local waters, it lit up a large area in front of me and washed the foreground in light that I found very distracting. The Video Pro 3 has an 80 degree beam and is very useable for macro, although unfortunately too hard-edged for wide angle work.
So, after a few days spent wandering the internet for a more modest beam angle, white and red settings, a user-replaceable rechargeable Li-ion battery and a depth rating of at least 300' all in a robust and sturdy package, the only option that fits most of the criteria is the L&M Sola 800P. I've yet to try one, so I don't have any useful comments on its performance at this point.
Sorry for the ramble, but hopefully it helps with criteria for selecting a light.