The LED4Si is the big brother to the LED3Si. The LED4Si has the most penetrating, intense beam of all the Lumicycle lights making it most suited to fast road riding. The beam width is also slightly wider than the LED3Si and this makes the LED4Si a good off road light too. 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.
The Pro5.2Ah battery is contained in a standard size lumicycle bottle option, which will fit most bottle cages.
Mtbr Bike Lights Shootout - over 50 bike lights reviewed, photographed and measured here.