Definately to low beam.
Gives plenty of light. If you fit to hi beam there's a considerable delay before it's properly powered up ie. just when you may need it.
Depending on the kit, the delay you get on high beam is approx 1 second. BUT, the light output before it warms up is still about the same as a normal bulb.
I have converted all bulbs on my 09 GSA courtesy of Les of this parish. I would also recommend going down the low beam conversion first. I find that once I have "powered up" my main beam for a minute or so it then behaves like an ordinary bulb set up but with much better light output. You will probably convert your main beam down the road. I converted my car a number of years ago and ended up having to convert the main beams too. When I put on main beams (bulbs) ther was no apparant difference with lights. I will never use ordinary bulb set up again. It's HID from now on.
well for what its worth I have both low and high beam HID's 50W if you only have one kit then its the low beam you should do but if you have both done there is no problem with the warm up time because the low beam stays on so you'r not in darkness while main beam warms up which is no time if your just dipping for on coming trafic
while you have the tools out put a couple of Piaa 600 Hid's on as well switched from main beam
I had high and low 35 hid, just removed the high hid and put a brighter globe back in. I didn't like the warm up time for the Hi... Sometimes you need instant brightness (flash to pass...) with some of the dim wits that drive in Sydney.
I have just fitted one to my dipped which I salvaged off my Blackbird before I swapped it for an 08 1200GS. It makes a dramatic difference. I haven't fitted one to the main beam for the reasons stated in earlier posts. Finding somewhere to 'loose' the ballast box and having the balls to start drilling 25mm holes in your new pride and joy are the only real difficulties. I opted to mount the ballast box under the oil cooler and strapped it on with two tie wraps and also used double sided numberplate mounting foam. Drilling the hole was easier than I thought using a 23mm carpenters flat bit. It recommends that you put a 25mm hole in the cover for the sealing grommet but I have found that the hole will nearly always come out bigger. 23mm bit and the grommet is a perfect fit.