As a helmet light, a Joystick might be a better option. I have both and I can feel the extra weight of the Diablo on the head ime, especially as the otherwise excellent Exposure mount sits it quite high up. I also prefer the spottier beam on earlier Joysticks for helmet use, though I can’t remember how the current one compares.
I’d also maybe, if you can afford it, look at the similar light with the wireless remote. Not used it, but on paper, looks ideal for hassle-free output switching.
Not saying the Diablo isn’t a good light btw, and it’s only 120g versus 87g, but I find it enough to be noticable, particularly on rougher terrain and the Joystick these days will still chuck out a claimed 800 lumens, which is usually ‘enough’ particularly if you’re also running a floody bar light.