Dan,
I used the single beam HID lamps... the dual (hi/low) beam ones have a magnet and a coil mounted to the lamp assembly that when you hit the Hi beam switch, it uses the electromagnetic coil to tilt the HID bulb to a different angle.... this changes the focal point of the internal reflector of the lamp housing and "simulates" the hi beam effect... by moving the actual position of the lamp inside the headlight housing, it changes the pattern of light being emitted by the headlight, not the actual brightness of the lamp..
Typically HID lamps require a "start-up" period before they reach full brightness as everyone will remember from being inside a gymnasium when the lights went out and then had to restart. Because of this the technology of the "tilting" automotive HID lamp was created....
I will have to add a diode to the electrical system on MY bike to keep the low beam energized as I switch on the driving lights for additional lighting on dark roads. Because of the lack of "instant-on" for high beam use there are even some after-market manufacturers that have halogen bulbs wired for the high beams and HID for the low beams.... this way when you hit the brights, the halogen bulb gives the additional light for the high beam situation...
Since I personally felt that I needed the low beam to be HID and didn't have any reason to need a high beam from the same headlight (because of the driving lights and how they were wired to the high beam circuit)...
But I may reconsider the need if I can find a source of low profile HID dual beam lamps..
As far as a link to eBay, I used a seller called XtremeHID... I think a link to his eBay store is:
https://stores.ebay.com/xtremehid
Their feedback is like 99.6% and over 12 thousand sales... I didn't hesitate to buy from them and was always pleased with the speed of delivery and communication with me. The only thing is that I think they only have single beam HID kits. But if you search eBay for dual beam HID you will undoubtedly find many other sellers.... just look at their feedback scores and if they are in the US (non-US sellers take longer to get your purchases to you due to US customs) My personal preference is for feedback score to be as close to 100% as possible for a LARGE number of sales... there will always be dissatisfied people out there, so if someone has less the 100% I read the complaints to see what the problems were....
I don't want to hijack the thread so if you want to move it to a different topic or forum, please do...
(DONE)
Rich