Originally Posted by
steelbikeguy
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My guess is that if you wire two identical LED headlights in series, there's a good chance that it will work. Presumably one headlight will have the taillight attached. The other headlight will have to be isolated from the frame... many are designed to have one terminal connected to the frame via the mounting hardware. If both lights were to have their ground terminals connected together through the frame, I think that one of them wouldn't get any power.
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Good point on grounding.
He said he is using an SP hub. I also used a SP hub in my light setup in the photo above in post number 4. SP hub is not grounded to the frame.
I ran one wire from the hub to one light, grounded both lights to the shared steel bracket (the bracket was part of my circuit), the other wire back to the hub was from the other light. Thus, I grounded the mid point in my circuit. Not sure what the OPs plan is however, he or she should be careful how they ground it.
And the taillight might complicate grounding, some are and some are not grounded.