Generally I can leave the bar light a little brighter within the 4 modes than the helmet light while just cruising along but I go max/max for downhill. Type of light also matters.
My niterider helmet light has a nice round pattern with the outer areas a flood and the center is a spot light. The Serfas bar light has a nice wide spread. Any shadows as a result of bar light is easily taken care of with the helmet light shining downward.
I'm partly bias because these are the only 2 lights I own and for a single riding season. And because I do not have external batteries and would not want the heavier light on my helmet.
I have a stronger light on my helmet with an external battery, I carry the external battery in my pack, then I have a 850 ish light on my bars.
I prefer to have the stronger light on my helmet and I find it easier to keep the battery in my pack then hang it off my bike.
I also like to have the stronger light on my helmet because there have been cases were I have had to loan one of my lights to someone and If I'm riding with 1 light I prefer that to be my helmet light.
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