Steve,
All of the driving lights I have seen are single wattage, no high beam.
I personally have high praise for the PIAA 510 driving lights, they are about a 4 inch diameter light, they have a stud mount, so they need to be bolted to a 'crash bar' type arrangement.
I have them on my oilhead , kinda wish I hadn't gotten the PIAA 40's for the R65, but they were only $85 at the time, seemed like a good idea at the time !!