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My own experience with a helmet lamp was it made you really difficult to ignore as when you're making eye contact there's also a bright light shining at them.
I gave up on it though due to concerns over what happens if you're in a crash. My feeling was that a lump of metal and plastic attached to my helmet may well be a bad thing. No idea if there's been any proper research on it though
I bought an Exposure Trace front light and use it mounted on my helmet as a “be seen” light.
During the day I use the day bright mode. Then in the evenings I use a light with a solid beam on my handle bars and the pulse setting on the Trace (on my helmet).
It seems like I am more visible to car drivers. I’m wondering if the light on my helmet has “humanised” me more to car drivers. I really recommend the light.