I love my Ay-up lights. http://www.ayup-lights.com/ Bright, lightweight, fast charging time, multiple mounting options, and they come with red caps that go over the lights to be rear-facing. I have the front facing medium beam on the bar pointed forward and the narrow beam on my helmet with the red caps pointed backwards. When I go mountain biking in the dark, I just flip the helmet lights around and take the caps off.