This UI seems not far off from what I imagined would be fitting for a flashlight. @koef3 already suggested adding moonlight as the unused long press, which may be intuitive enough and useful. The only thing I would change is cycling through light levels: not around, but up and down (i.e. not LMHLMHLMH… but LMHMLMHMLMH… I’m split on memory: it may be handlier to always start from low.