I've heard that about helmets, not about lights. And I've never been willing to enter the great helmet debate. If people don't want to wear them thats their own business, but I won't have anyone telling me I'm somehow in the wrong because I choose to wear one.Is there a study where they show that drivers are more likely to drive closer to you if you have lights on your bike? Seriously though, the amount of ninja cyclists that come out of nowhere when I'm driving is unbelievable. Especially in this leafy suburb on the edge of the city, some of the roads don't have much in the way of street lighting.
But whether you wear a helmet or not, cycling in the dark without lights is something I would never do.
I drove into town on saturday night past and there were a lot of cyclists coming the other way. I'd say 4 out of 5 had no lights.