See my post in the other thread about the german and korean bulbs.
I have not used the Mr. Jungs system, but have looked at many. I like his because 1) he uses quality ballasts, bulbs, connectors, and mounts, 2) he pays attention to getting the bulb filament in the correct place, essential to maintaining a beam pattern, and 3) he understands that higher color tempurature is not necessarly better, higher lumes are.
People don't realized that the bluer the light the more bad things that happen. Mainly, 1) greater light scatter due to shorter wavelengths, 2) more eye fatigue (thing the difference between cool white florecents and incadecent bulbs, and 3) less light output (lumes). Natural sunlight is 6500k color tempurature, why anyone would want bulbs that are blue (i.e. 8300k) is beyond me. The idea is get a nice white light, not a blue light.
Cary