A couple of buds I ride with changed out their stock Roadglide bulbs with HID’s. I ordered a set from the company located in Elk Grove, CA. I have to say they are a huge difference in visibility for both the rider and oncoming traffic. I’m hoping they are robust enough to withstand the shakes and bounces of my lowered front end.
I chose the 6000K temperature model. It has the bright white light I was looking for. I think any higher it starts to have too much of a bluish tint.