A lot of us have used DDM and personally I have had perfect performance of mine. I suggest 35w 6,000 warmth, which gets you as much usuable light as the 55w 4k versions, with a nice blue appearance to boot.
Don't have any information about the ones you are looking at. At least, consider DDM.
DDM Tuning
They are pretty easy to install. Be sure to specify (and reiterate in bold print) you want miniature ballast units, as they are easier to mount.
I put everything in the upper cowl, so if I remove the upper cowl, it all comes off in one piece and I only have to disconnect the main leads from the wiring harness. I have used silicone adhesive (sort of like clear silicone sealant) from Locktite to affix the ballasts to the inside of the upper cowl, and used tie-wraps to affix bubble material wrapped starter modules to the headlamp frame that bolts inside the upper cowl.
So everything is one "unit". Just have to figure out where your free spaces are. I have two up near the windscreen, so you can just see them between the top of the instrument cluster and the inside of the windscreen. The other two are down along the sides of the upper cowl.
It is amazing how well that silicone adhesive works, thousands of miles and many railroad tracks and none of them have come loose.
By the way, the ballasts get hot, so having them where air will flow over them is a good idea. I can feel the heat through the side of the upper cowl after running the highs on the way home from the American Legion Riders meeting, for example. Not hot enough to bubble the carbon fiber, but very warm.
* Last updated by: privateer on 10/13/2010 @ 5:07 AM *
Living the Gypsy Life