A few people have requested photos of the lighting setup on my Geekhouse Woodville tourer. My view on lighting is pretty simple: throw a big beam where you illuminate not just your bike but the road around you. The Portland Design Works Aether Demon USB light is mounting via the included seatpost clip, but I removed the ring and just attached the clip straight to the rack mount on my bike. Most all lights come with a seatpost mount. I’ve found this method to not only be more secure than a seat stay mount, but much more successful at lighting the surface of the road, increasing visibility.
This position puts the light low and to the inside of the road, assuming cars are driving on the right of the road. If I were in Australia or UK, the light would be on the reverse. The same goes for my Edelux front lamp, which is under my Wald basket.