I've been using the Ligh & Motion VIS 180 rear light and their Urban 350 front light for a few years now. USB rechargeable and about 6 hours with the front light on pulse and 5 hours with the rear light on pulse as well. I only ride during the day but I've tested both at dusk and at night and they are very visible. List price is $150 for the pair but they're always on sale for less.
http://www.lightandmotion.com/choose-your-light/vis-180