I thought about spoke light, but with the amount of bikes I have, it was something I did not wanted to deal with. Instead of spoke for side light, I chose mini blinkies on my helmet instead. One on each side, and the addition of the P7 gets their attention. The batteries are 2032 and I can get a bulk pack from DX for a low price. Good news, most driver from side such as a stop sign will yield for me, but there still some who just don't know what to do as if they are surprise or confuse at the amount of light I have. Much more driver education is needed.
Edit for: Forgot to mention, another reason I use a higher mount side light instead of low is because driver next to me side by side see my light at the helmet much better than wheel mounted in which case where most of the time, the wheel mounted light is blocked by their door especially when you are on there passenger side.