I not totally disagreeing with you but the OP was looking for a "See Me" flashing light for front bar use. True, a lower powered ( < 200 lumen ) lamp might not be what you want for full day time sunlight use but once the sun gets lower in the sky or you begin to ride through shaded areas the lower powered lamps work very well as "See Me" blinkies. If you doubt this go into one of the local stores that sell the lamps and check it out inside the store. You'll be amazed at how well they work. If you use a higher lumen lamp for flash duties at dusk or at night you will find the reflective feedback to be "TOO Distracting"...both to the rider and to those around you.

During the day ( when the sun is high in the sky ) and I ride the two lane roads busy with fast traffic I will use my higher powered "See Me" flashers. For me that is the Gloworm X2 on "Beacon mode" ( ~1200 lumen )
and an XP-E amber flasher ( ~ 140 lumen ) on the rear. I only use the Gloworm when needed though. If it's a two lane road that allows cars to pass...yes, I'll use the Gloworm just to be on the safe side.

Otherwise when the sun is setting or at full dusk I'm happy just to run my flashing 70 lumen Axiom up until the point it is dark enough to turn on my steady lamp. When that happens I take the Axiom off my bar, switch it to "flicker mode" and mount it to my fork leg. With the GWorm on the bars and the Axiom on the fork I have two divergent points of reference for people viewing me from the front. On "flicker mode" there is little reflective feedback to interfere with what I am seeing when I ride down the road. This works for me.