Nearly correct.
Erm.....it's an HP2, which uses a single H4 bulb
H4 HID's are a bloody nightmare, as there will always be a compromise in beam pattern unless they are fitted to a reflector designed for a specific HID H4.
Except that H4 reflectors are a compromise in their own right. It is not possible to design a reflector to provide perfect dip and main beams from the one lamp.
The HID lamp accentuates the problems.
I had a Smart fortwo with H4s in it. I fitted a set of H4 HIDs from EBay. The beam pattern was so poor, with a great black hole in the middle of the dip, and a useless, diffused main beam that I took them out again after a couple of weeks.
I bought an apparently identical set of H4 HID burners from Les Wassel, and they were superb.
Think about general lamp and reflector design. For a perfect reflector, one must have a single point of light. This is impossible, given the nature of filament lighting. Thus, even with a single filament lamp, a reflector is a compromise. It so happens that the arc in a HID lamp is the same length as the filament in a standard lamp, so there is no reason why a HID fitting should require a different reflector.
Bearing the above in mind, a 24v filament such as one finds in a lorry is substantially longer because of the higher voltage. Because of this, it follows that the beam pattern should be inferior to a car. ( Think standard 7 inch round here) Indeed it is, with a rotten pattern compared to a 12v system.
It also follows that 6v lights as fitted to old cars should be superior. They may well be, but, unfortunately, the voltage drop on 6v systems caused by the associated high currents kills off the possible benefits, leaving one with a light output comparable to a candle.
When I bought my R1200rt many years ago, I decided to fit 35w HIDs to it. This was a total nightmare of a job. Plug them in as supplied, and 1 worked perfectly most of the time, and the other 2 failed to "Strike".
Much investigation showed that the BMW "no Fuse" monitoring was so tight that the inrush brought about on lamp startup continually tripped it, leaving one without any lights. After much puzzling, I fitted relays to all 3 light circuits, and got them to work, but I was now faced with the LampF fault.
I fitted canbus fault cancelling capacitors to get round this.
Been working now for over 4 years without a fault, but I would not care to put the effort into another such job. It was a nightmare.
If anyone wants a full drawing of what was done, I will post it.
Myke
P.S. The pedant in me says: "They are lamps, not bulbs"