You are certainly correct about the light temperature and visibility. I have run 4300k HID kits in the past on other bikes.
The great appeal for the Super Ten with LED conversions like Nighteye and Novsight is the lack of ballasts and fans. With our rear dust cap design, being able to easily tuck everything inside and install an extended dust cover to seal it again is very appealing.
HID ballasts are getting smaller and HID Aux lights now often come with internal ballasts, but for headlight conversions that ballast usually ends up outside the headlight assembly and diminishes the water/dust seal at the rear of the headlight.
There are some 4300k light temp LEDs being offered to the US market. I have no experience with any of these brands though. I see 3000k color temp kits for yellow light, but not sunlight color kits. I found a few 5000k & 5500k color temp kits also, but again, unknown quality.
So where can you get the extended dust cover? Thanks.