Guesstimate on my part, complicated by the fact that I run about half my sometimes late-night urban commute in stealth mode (places where I don't WANT them to see me coming).

Might be I'm just old... fer years and years during my last bicycle period my commuter lighting was accompanied by the "wzzzZZZZzzzzZZZZzzzzZZZZZzzzzz....." of the generator down below the crank, the feeble and uncertain glow of the head-and taillight bulbs, and the loss of EVERYTHING when it was wet

Hey, reliable visible lighting fer 10 bucks? There's gonna be a couple more of these things laying around my garage fer sure

Mike