The lighting on the FJR OUGHT to be excellent - dual H4s with HUGE reflectors OUGHT to be bright, but for some reason they don't seem good enough. I tried PIAA bulbs - they're whiter, but on a dark country road it isn't enough for me.
Part of the problem is likely voltage loss in the 3 feet of wire between the battery and the headlight - you can especially see it by looking at the front marker lights when the modulator is active.
This bike would benefit from a 'headlight harness'. But I have no idea where I could stick it all go on my ride - I already have a pile of wiring and controls on my bike and I still want to install an Audiovox cruise control unit - the problem is that I don't think there's room left for it anywhere convenient.
I left the stock headlights alone - I wanted to keep my headlight modulator for daytime use and in any case the reflector in the FJR isn't designed for HID bulbs, so the result is most often less than optimum, not to mention that conversions aren't legal which can be a problem if your jurisdiction does inspections or some picky police officer is looking for a reason to write you up.
So I installed HID driving lights (Hella Micro DE Xenon) on Garauld's mirror-mount brackets.
The Micro DE Xenons don't throw quite as much light as a reflectorised unit like the HID version of the FF100 because there simply isn't enough room in the fixture - but they DO throw a lot - they make the stock bulbs disappear. And they are small enough to look very cool.
I scored my set on Ebay for an absolutely excellent price - 2/3 the score I made to buy the first set I had installed on my old C10 - those died in the crash - but I remember them fondly (photos of THAT installation available in my webshots album - I will be posting shots of the install on the FJR later this week)
The point? Consider auxiliary lighting as an alternative to a conversion.