Is there some advantage to those M12 lights as opposed to battery powered camera lighting?
I think you're alluding to the idea that a light is a light, they all exist in the same competitive marketplace and are somewhat commoditized by the fact that their output is "just light". I agree with you.
That said, yes, of course there are advantages to milwaukee lights. They make so many different models it's hard to say, and you haven't named a specific camera light to compare, so here are some possible things: uses batteries you already have and available with high capacity if runtime is a problem, most are 5 year warranty length and built well enough to not need it, and most are adapted pretty well for some specific task (why they have so many)
myself, I have mostly ryobi lights, since a light a is light, and I find milwaukee to be the wrong level of price : performance. I was in a bind and ended up with both an m18 2360 flood light ($100 on sale) and a close ryobi competitor P721 ($30-40 on sale), and they're effectively the same light. maybe I could drop the m18 from a few feet higher without breaking? but that's not worth $70, to me at least. oh yeah, the dimming options on the m18 are better, and I do value that. but still, not $70 better
