RSP ASTERI 3 FRONT LIGHT This 3 Watt headlight provides a fantastic bam- ideal for commuting. The alloy case and waterproof construction means this light will stand the test of time. The integrated Li-ion battery provides exceptional performance and a clean look to your bike. Rechargeable headlights can often have ungainly battery packs that need to be strapped to your bike; another reason why the Asteri 3 is a great light for city use. 200 lumens output. Burn time up to 5 hours.