Why is frequency-sensing design?
Once the sun sets, it's more difficult for you to see holes, bumps or ice in the road. When you decide to take a night running, you should be hyper-aware of the terrain ahead, stay alert and tuned into dark surroundings. At this time, you need a brighter light for night running.
We recommend JD-15181 - The Intelligent Frequency-sensing Outdoor Headlamp for night runners. Both med and high in spotlight mode have a frequency-sensing design.
When you are running at night and wearing an JD-15181 headlamp, the built-in light sensor makes it deliver optimal brightness intelligently according to your stride frequency. While you stop running, the built-in sensor would be locked, which means the brightness would not automatically change.
What is frequency-sensing design?
The JD-15181 is set at med mode in spotlight mode.
1. When you are walking, your stride frequency is low so that the headlamp's brightness remains at 130 lumens;
2. When you start running, the headlamp would only increase the brightness on the basis of 130 lumens in case the stride frequency reaches 150 strides/min; while the stride frequency reaches 220 strides/min or even higher, the brightness would only be maintained at 200 lumens, it would not increase anymore.
3. As you gradually reduce the speed (the stride rate gradually decreases), the brightness also goes down, and once it drops to 130 lumens, it would not drop again.