What is the advantage of buying additional magnets to your SL100 / SL200 Series lights?

With an extra set of magnets, you will get even more light out of your bike lights. If your light set is without ReePower™ you will also see an increase in the blinking frequency. For the ReePower™ models, the capacitor recharges much faster, which can be an advantage if you cycle in cities and often have to stop at red traffic lights.