These lamps use reflective technology which comes from the automotive industry very bright led technology for your bicycle it will light up the road you will feel much safer on the road you can chose from 2 brightness settings full brightness 28 lux which works for up to 30 hours half brightness 14 lux which works for up to 50 hours ipx4 k 862 the rear light with 3 smd leds ensures that you will easily be seen by other road users this works for up to 45 hours ipx3 k 816 thanks