Light & Motion Vis 360+. I own this light. Beam pattern is excellent, makes it seem brighter than it is.
Light & Motion Vis Pro at REI.
Anything by
Lupine. I'm seriously considering the
Piko R4 Smartcore.
Everyone seems to use their own light as the threshold above which everything else is too bright. The fact is that a brightness has more to do with runtime then it does max light output. A higher output light will have a longer runtime compared to a lower powered light at the same light output. A 5000 lumen light for example, will run 10+ hours at 900 lumens where a 900 lumen light will run two or three hours.
I have been using helmet lights for a decade. If you don't shine the light directly at drivers then blinding drivers is not a problem. It's is literally as simple as that.
-Tim-