We do HVAC work and need them for clipping on our caps while working in tight spaces, closets and attics. These spaces aren't always all that dark but bright light is still required.
Runtime... I guess as long as we can get a day or two worth of work out of it before changing or charging the AAA. Four hours would be great but don't know of anything with the output desired and that runtime.
It'll be scratched up, banged up, dirty and possibly lost. So spending more than $20 isn't viable, and weighing more than a single AAA light isn't an option. Neither is powered by Li-on. Care will not be taken to make sure they don't overheat.
I realize the Zebralights are nice, but a bit expensive and probably not ideal due to weight, orientation of the clip, and CR123s. I DO LIKE the flood...
Call us funny, but we will not use head bands. Seems like a hassle with so much going on at the time already.
If someone has a used and already banged up Zebralight for sell really cheap that might work.