When I first got the HS21, I thought that it had too many options: 4 emitter choices on the dial times 5 levels each that’s 20 possibilities.
The trick is to think of a dial as the only thing you want to touch when you have the lamp on your head and ‘preprogramme’ the level that you want to each of the four dial choices.
This is what I do:
For camping: Spot on Moon, Flood on Low, Both on Mid.
For bicycle: Spot on Turbo, Flood on Med, Both on High.
What other setting do people find useful and why?