SOS: What is the brightest clippable safety light?
 

What is the brightest rear safety light that can be seen during day rides? I'm looking for one that can also be mounted or clipped to helmets, bags, or a rack trunk. I've heard much about the Planet Bike Superflash. Any others? What do you suggest?

Please give me your feedback. Time is limited!

http://www.cateye.com/en/product_detail/550

kind of heavy for helmet though, not that it's really uncomfortable IMHO.

Superflash is much lighter, beam less directional than the cateye but superflash lacks lateral beams that are quite powerful with cateye. I keep cateye clipped on saddlebag with constant beam and the feathery superflash in strobe mode clipped on helmet back vents with a velcro. Two safety lights is the golden standard if you want the approaching vehicle to estimate its distance by the opening distance between your two rear lights (works for cars)

I've got them all, except for the REALLY expensive ones.

This will be the most noticable in daylight and in the darkness. The CLEAR lens is the one you want. The others aren't as good. These lights have a history of not being reliable. I've probably owned 8 of them. But they are so good that i always buy new ones.

http://www.lightmanstrobes.com/basic.htm