Just bought the Performance Viewpoint Dual light system several weeks ago.

http://www.performancebike.com/shop/...html?SKU=14193

I've used it 6 times now and am quite happy. The 12 watt flood is enough light for most situations on the city streets and the 12 watt spot is great when more light is needed on trails. Right now I need the light for about 1 1/2 hours each day but I think when it really gets dark earlier I'll need it for almost three hours. It's rated for that lenght of time. My fingers are crossed.

Don't forget a good and bright red flashing light for the rear.