You should just save your money and buy something worth a shit, your wasting your time on trying to buy these super white halogen bulbs. If your really a serious night rider, then you need to get a better lighting setup.
What mods are done to your bike? There is no such thing as an all around pipe, so your going to need to pic a power area and go after the best pipe for that range.
stock is 12v ac. doing a bulb conversion with a ballast is too bulky to be worth it for hid's.
The Solstice LED light puts out 900 lumens, and the spots project just as far as an equivelant outpu HID light does.
I had a rough time getting my rear apart, it wasn't possible for me to get the spring compressed far enough to get the "c" cup out. Now I can put all the shocks back together with the tool and not scratch the spring either.