I hate to repeat myself but...
HIDs can be good and can be bad. Anything above 5000k is bad. Period. 4300k is the only legal color.
As color temp goes up, output goes down, lifespan goes down, and blue goes up. Blue is very bad because your eyes can not focus on blue because the blue receptors in your eyes are outside the cornea (focal point).
4300k = 3500 lumens
5000k = 3000 luments
6500k = 2000 lumens
8000k = 1500 lumens
stock H7 55w bulb = 1200 lumens
PLEASE... save a life do not go any higher than 5000k. As a bulb ages, it becomes more bluer. a 4300k bulb is at 5000k after 100 hours. After 1500 hours a 4300k bulb may be at 7000k or more. Also light output decreases with time. So with a 6000k kit after 100 hours you may be at 8000k and 1000 lumens... unknown manufacturers have poor quality control and their bulb color shift at different rates often, so you have one yellow one blue bulb.
Also, I personally think having an HID highbeam is a very bad idea because you can NOT flash. It takes an HID ballast a few seconds to restrike (called hot restrike) the arc tube in the bulb. It is bad for the bulb and ballast to be flashed.
There is NO difference in motorcycle vs. Car ballasts. The bulbs are the exact same so the ballasts which drive them are also the exact same. Maybe they put a different name of different ballasts, but the absolutely all work the same inside. You can get an OEM ballast for 20-70$ on ebay anyday of the week.
Plus it's not legal for a headlight that doesn't already have HIDs. Not that it matters, but the reason NOT to get HIDs is the bulb pattern is messed up because the focal point of an H7 bulb and a HID D2S/R bulb is not in the same spot. This is something like what your headlights look like after a BAD PNP kit. I'm not saying yours look like this exactly, but the glare is unavoidable, YMMV. Point is you're not getting the light where it's suppossed to be.
Now, The ONLY way I would ever reccomend HIDs is with an OEM kit. Because you can buy replacement parts for it individually, where as with a PNP kit, when a bulb blows, you're **** out of luck and have to buy a whole new kit.
A OEM pieced together kit should only cost about ~120$ MAX.
This is what you need to convert an ordinary HID bulb into H7... 10$ for 2. Plus 75$ for a ballast, 30$ for a bulb, and ~10$ for harness parts.
This is what you should do:
Of course you need only 1 ballast because you're not going to use a HID light for high beams right?
And as "unattractive" as some people think the 1 light is. You never have to look at it. period, people who complain are only looking for show. Honda is one of the best lighting manufacturers (stanley actually) and they have provided us with an excellent lighting system which requires NO modification to be exceptional. Our bikes are only 3 feet wide you DON'T need 4 headlights (2xlow, 2xhigh).
If you really want to upgrade your lighting system, make yourself a 12 gauge relay harness from the battery like this:
and get yourself some H9 bulbs on H7 base which are like 2200 lumens (2x stock brightness) and you will have the beam pattern our lights were designed for and no glare. The Best lighting system while staying within all quality parameters (i.e. beam pattern, output quality, lumen maintenance etc...) is the H9 on H7 base. You can get them here from Daniel Stern Lighting.
http://www.danielsternlighting.com/p.../products.html
or here:
http://www.rallylights.com/hella/H7.asp
The owners of both these