I have a Cygolite 460 that I've been using on my road bike for daytime riding. It's got a bright flash daytime mode and will last for longer than I am ever likely to ride in a day.

I just recently purchased a Garmin 530 and its pretty crowded on the bars now. My Roubaix has only a small area near the stem where the bars are round. The cygolite only has mounting provision for round bars with a rubber strap and can't attach to something that would fit the underside of the garmin mount.

Anyone have suggestions on a light that will easily adapt to the garmin mount that has a bright daytime mode that will last 8 hours or more on a charge? I almost never ride my road bike at night so daytime mode is my primary concern.