In building my winter commuter bike I am thinking of adding dynamo lighting, and am interested in trying a new bottle style dynamo like the AXA HR (to test the waters without committing to a new wheelbuild). I live on an unlit country road and need a relatively bright headlight so I'm looking at the newer B+M high output lights. Are there different lights for hub dynamos and bottle dynamos or are they all interchangeable? I think it would be smart to buy good lights and if I feel the need to later upgrade to a hub dynamo, but I don't want to fry some expensive light because I used it with a bottle dynamo.