To this point there is no substitute for the standard glass envelope, filament bulb in the OEM optics. Bulbs in the yellowish end of the spectrum give better contrast, bulbs in the bluer end of the spectrum give the
appearance of brighter light.
Filament bulbs primarily get extra brightness by using more current through the filament but this causes the filament to erode faster. There are games with filament materials and the gasses in the bulbs, but in the end, brighter leads to quicker burn-out.
HIDs can provide more lumens but the linear capsule doesn't work in the reflective shell the same way as a horizontal filament. Plus, the HIDs don't yet do as good a job as both a high and low beam light source. You get better light, but it doesn't shine down the road in the same beam pattern. A HID bulb in a HID reflector does a good job of producing lots of lumens at a lower power factor once ignited. There is a reason the base of the bulbs are keyed, they always put the filament in the same location so the light is focused through the reflector/optics in a specific pattern. Neither the HIDs or LEDs are complimentary with the OEM reflectors.
LEDs are even worse for use in the OEM reflective optics but can put out a lot more lumens with less power. Along with less than optimal beam pattern, the LEDs come with heat-sink bases or with individual fans which are miserable to get into the tiny motorcycle clearances. A LED bulb in a LED reflector does a good job of producing lots of lumens at lower power and delivers the light in a good beam pattern.
Right now the best compromise seems to be a brighter standard filament bulb and accepting the shorter life. Don does the correct thing by staggering when the brighter bulbs are installed, hopefully by at least a month because the bulbs tend to burn out within hours of each other. It wouldn't hurt to carry a spare high zoot bulb under the seat for those little on-road emergencies. Umm, along with a flashlight to hold in your third hand so you can see what you are doing with the other two
On the other hand -- I now have some really good flood LED driving lights that I use to supplement my headlights, running them at ~30% at night. When the high beams are turned on it automatically triggers the LEDs to go 100% power which is like turning on stadium lights. During the day I get the advantage of being more conspicuous and at night I get the advantage of a LOT more light. IMO, right now this is the better way to get more light.
Edit: While I was typing Ross was posting, we ended up with overlapping info.