Also worth looking at the Baja Designs Squadron lights
https://www.bajadesigns.com/products...e-Lighting.asp
There are several different options for suppliers of auxiliary lights if you prefer to add extra lights rather than replacing/upgrading the current unit. Auxiliary lights are not as neat but are easier to swap between bikes.
Another option would be to simply fit an LED H4 bulb (may also need a DC reg if you are only running AC). It might not be quite as good as the BD or enduro-tech options but it is sure to be a lot cheaper.