The 1TB 2013-up V7s seem to vibrate a lot in the crash bars.
I actually removed the Agostini crashbars I had installed, because they intensified vibrations at around 5,000 rpm. A normal cruising rpm for me.
After reaching down to feel how much the crashbars vibrated on my 2014 V7, I don't see how any lights could live very long mounted to them.
If/when I add some Denalis, it will be to the forks.