I have some sets of old Cateye lights - the sort of slightly elongated hexagonal looking ones. I don't know where they came from. I can't recall buying them. I regard them so lightly that I often leave them on my bike when it's locked up in town. Yet they always work and have never been nicked. I often have them on flash as a second set with a brighter light on steady. I suppose these would be the modern day equivalent.