Originally Posted by
PaulRivers
I had the same thought, and interestingly, it looks like they do:
TL-LD570-F | CATEYE
From the page:
The Reflex Auto will automatically turn on whenever both darkness and motion are detected by the motion and light optic sensors. No more stopping on the bike path to double check that you’ve turned your safety light on – it’s automatic!
Ten reviews at Amazon give that model a 3.9 rating with a spread from 1 to 5 stars.