I mounted a couple of 55 watt automotive type (Dietz) halogen driving lights (not fog lights) to the engine guard bar. Sure, not fancy (and expensive) Harley driving lights but they sure light up the secondary roadways at night. They are wired to a relay which are in turn wired to come on with the two high beams. Once you use the extra lights, you'll never go back to just the stock headlight or headlights. The only problem I have with them are that they attract millions of bugs in forest areas. I enjoy riding in the cool of the night. They are "bug magnets." On last weeks ride from the Reno area to Seattle, everything facing forward forward had bug juice: Top of my helmet, windshield (obviously), fairing, struts, engine guard bars, mirrors, front of the saddlebags, and bug juice stains on the front exhaust pipe chrome. Five minutes in the hand spray wand car wash got rid of most of the bug impact points except for the exhaust pipe. The bugs cooked into the surface of the pipe and will require polish to get rid of them.
I wouldn't recommend auxiliary halogen driving lights for a non-windshield motorcycle, unless you enjoy riding though a rain of bugs when the lights are turned on. Anybody riding past the lake north of Klamath Falls, Oregon at night knows exactly what I'm talking about. Imagine 20 plus bugs (mostly mosquitoes) per square inch accumulated in less than 10 minutes covering your bike! It was gross! During daylight riding through the forest areas with the auxiliary lights on, most of the bugs impacted my legs behind the driving lights. I'm going to try the blue halogen bulbs to see if it's a different light frequency that bugs aren't attracted to. I don't like amber colored lights.