Is there a bike light law?

They do see you. and you can be aware of them especially if you not listening to your iPod. Also they will have lights on. you can see the beam. The fact that I can ride without lights on the roads at night in London and get overtaken by vehicles who give plenty of room tells me different. I trust my own experiences. sorry if you can't handle that.

You are presuming they have their lights on.. you've said yourself that other vehicles don't always have their lights on. Fail.