Sorry I can't really help. However, I have been told by other bikers that the signals on the Rocket seem a bit dimm. I haven't been able to turn the beast over to anyone else to ride. On other bikes I have owned, I usually swap during during a ride.
I put a set of Muth signal mirrors on my Rocket The guys I ride with tell me that they are very bright and easy to see. There built for an HD but with a little spacer and a longer bolt they work great on the R!!!. They are a little expensive but I guess it worth it to be seen. If you would like take a look go to this web site .Hope it helps.