In the past I never felt a need for a daytime flasher, but have had too many close calls with cars which concerns me especially when riding our tandem with my wife. For night rides we use a Magicshine with a large stem mount battery which I am pretty happy with especially after getting a new Hope universal bar mount for the light. I also have a Cygolite Metro 400 which I bought mostly for use on my bike since I didn't always want the big Magicshine lite.
So I have been using the Metro for a daytime flasher on the tandem. Its plenty bright enough, but it sticks up kind of high off the bars and gets in the way of my Garmin which on a K Edge mount in front of the bars. I would like something smaller and lower profile that I feel I can leave on the bike all the time. One option I found is the Cygolite Dart series which comes in 210 and 350 lumens. I am not sure if the rubber band mount will be good enough though. Also found some mounts for both a Garmin and light and put them out front of the bars which would be ideal, but the combination of the mount and light is too expensive. Thanks for any advise.

Just found this, it might be what I am looking with the 300 Lumen light:

http://www.guee-intl.com/products/imount