Occasionally I ride to work in the morning, which at this time of year is about 30 min. before sunrise. It's light enough that some drivers don't feel the need for headlights, even on the always-use-your-lights 'safety corridor' section of highway where I have to ride. Kind of makes reflectors useless, so I got myself a wheel light. It's fun with its changing colors. It's not terribly bright, but it's only for 'hey look at me!' purposes.

Case in point; riding in on Monday morning, everything's greyish (and gorgeous; I love riding around the bay), and suddenly a cement truck flies by me, no headlights; I may have peed a little. I had checked my mirror, but still didn't see him. Jerk. The moral of the story is, don't depend on reflectors. Wear garish clothing and LIGHTS ON EVERYTHING.