Grand Prix 250
Main Motorcycle: Black 09 Sprint ST
Join Date: Aug 2012
Location: Queensland, Australia
Fairly sure you adjust them the same way as a car with a spanner on some nuts on the back of the housing. I havent had to do it myself though so i havent gone hunting.
The D2D's can work two ways with the diffusers provided - either light ahead quite substantially, or diffuse and give you corner lighting. Not so good for oncoming cars so i have plans to them set up to run on high beam only (unless i override with a manual switch).
On the tiger referenced above, the rider describes it as good at either setup, but not enough at both - to say, have one as a spot and one as a diffuse.
It might take a little for me to get the bike finished off, but i plan on doing a review of all the stuff im doing, lights included.