Originally Posted by
Rockfish
They help. I wouldn't rely on them to replace lights, but they certainly help. It's best to put it on moving parts - crank arms, rims (the inner face, not the braking area! - because the motion identifies you as "bicycle" rather than "lamp post."
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Interesting that you mentioned this. My observation from watching other bikers at night is our little LED blinkies get lost in the clutter of lights that a driver sees. However reflective materials on moving things like wheels or cranks and really bright sources of light caught my eye more.
My rear lights are a standard blinkie and a Coast Guard life preserver strobe. The bright flash stands out in the ambient light.