The LED3Si has a penetrating beam perfect for riding at any speed on the road. The beam wont annoy oncoming drivers but will make them very aware of your presense. The beam has enough width for illuminating the side of the road and can be used for trails and some off road riding. Two important safety features make this light essential for road riders and commuters. The glow-ring on the front of the light helps you to be seen from the side by other road users. This is critical when passing a left-hand side road, waiting to turn right onto a main road and also on roundabouts. The other feature is the integral eyelid that helps prevent any upward glare to the rider in dark country lanes. This system comes with the powerful Pro 5.2 Ah battery which is designed to give long run times. This battery will mount under the top tube.
With the Pro5.2Ah bottle battery option, you have the advantage of riding with a very robust, all weather battery that will fit snug in your bottle cage.
Mtbr Bike Lights Shootout - over 50 bike lights reviewed, photographed and measured here.