A rider in front of me complained about my lights today. We were riding over a bridge, at night, I was behind him as he was slow but the bike path at the edge of the bridge was narrow, he had a helmet mirror, probably my lights were flaring in his mirror. I have to remember to be more considerate and shut off my helmet light in times like that.
Here's a pic of the bike's handlebar light (lower) and the helmet light (upper, helmet is set on the garbage can that the bike is leaning on). In real life, the handlebar light is not this annoying as it is pointed down. But if the helmet light is pointed right at you, it is this annoying.
Good post, and dam good lights!
The helmet light is used for turns, to alert people that you are coming that way, also the movement of the light on your head, brings attention, which is good. Also, and IMO, one of the helmet lights most important jobs/tasks is to alert, warn, and sometimes more then often, stop someone from taking your right of way.
Example, I have the green light approaching an intersection, a car is getting ready to turn on red. No problem with that, but don't cut me off with that move. So, if it appears that the car is going to move into my path, where I have the right of way, they will get a 18650 or 26650, aimed right at them. Believe you me, they adhere to the warning with an abrupt stop, and allow the old me to proceed on his way..