I put a set of Trail Tech HID light on the bike this last week. Tested them out one night.
You can't even tell the stock light is on. I have the Euro light also. I'm headed for a little ride this weekend (about 1600 miles), should give them a good test. Headed toward Canada. I'll post some pics when I get back. I made some custom mounts and put them on the forks. Now I have light where ever I turn the bars. Just like my LC4.