Figured out a great way to mount my Fenix lights. This is perfect if you have lots of space on your front rack.
I found some foam "tubes" at a local surplus store. Then I slit the bottoms so they would fit around the bars. Then I built up the rear by wrapping a couple pieces of old tire tube around one of the beams so the lights would be angled slightly down. Then I used blue electrical tape to tape them down. Blue tape works best. They are secured by two O-rings per flashlight, with an additional large O-ring for redundancy because yes, I know, the Space Shuttle blew up because of an O-ring failure. They are still adjustable by adding shims if you need to. Popsicle stick or something, little twig maybe, works fine.
Here are some pictures taken with a better camera. I can't figure out how to get a good nighttime shot so if anyone has any tips please let me know. The lights are pointed pretty low in the one early morning shot.
I too use Fenix L2D as a bicycle headlight and can attest to that model's brightness. It is very nice to have a high-quality, long burning flashlight that uses only 2 AA batteries. On bright the light runs for over 2 hours, on low it burns for 50+ hours. If you camp, this light is great and if used the the diffuser it serves well as a general area light too.