HID...the H stands for High, the I stands for Intensity (gas), the D stands for Discharge. Hence the name HID kits. Ordinary bulbs run on 12 volts to heat the filament (the very thin wire) within the glass dome (the head of the bulb), the gas within the glass dome then heats up to produce the light.
With gas discharge, the ballast unit (the amplifier/transformer) is powered by 12 volts (battery voltage) & this converts up to 24k Volts. This high voltage (the discharge) ignites a very small amount of xenon gas within the centre tube of the light unit (a small round ball like container halfway along the lighting tube, what lay men call the bulb).
There is not a direct replacement HID unit (bulb) that will plugs into the two pin wiring plug like a H7 bulb. H7 bulbs use either halogen gas or xenon gas at only 12 volts & that's why they will never be as bright as HID.
I have never seen any HID aftermarket units made anywhere other than China, I import them into the UK. OE manufactures use HID units supplied by Bosch, Osram & Phillips. Although these companies are either German, UK or US based doesn't mean that the units are made in the same country that they trade from.
Smarts cars are made in France & not Germany, the biggest manufacturing plant for VW Passat is in Mexico & Bosch last year closed their biggest manufacturing plant in Cardiff, South Wales that made alternators because they could be made cheaper in Romania.
I've over forty years experience in auto parts, it's my living.
My Smart now has 65,000 miles & my wife's has covered over 55,000.
Best regards all, ****