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Chaley
Basically they need to be simple to use in the dark, in rain, whilst riding, with freezing cold hands etc. (I'm primarily thinking of commuting/general lights here rather than Exposure style highly engineered lights):
An easy attachment system that fits multiple parts of the bike and is sturdy.
A simple operating system with 2/3 modes max of flashing and static.
A built in usb charger (lezeyne do this already) which means you don't need to carry a cable and it can be charged quickly via a computer.