I have NiteRider MiNewt 600(https://www.google.com/#hl=en&tbo=d&...w=1600&bih=799). I has helped tremendously, when I got caught in the dark. NiteRider stopped making that model. They replaced that one in their product line with, the Lumina 650(http://www.niterider.com/lumina-650-2013/).

The MiNewt 600 is still available, just not from NiteRider any more. That is why I did the Google search for you. The Lumina 650 looks just like it. If you want even brighter possibilities, NiteRider has headlights that go up to 3600 lumens. I have no idea why a cyclist would need 3600 lumens. I have the MiNewt 600 and I get motorists' honking at me, about how bright it is.