The importance of a suitable bicycle light for night cycling cannot be overstated. Some cyclists like to use ordinary straight flashlights as headlights, but cycling is not a one-person thing, although they can see clearly, but if the brightness is too high, it will interfere with the vision of the opposite side, resulting in accidents.

In addition, the straight strong flashlight as a cycling use, the spot distribution effect will also have an impact on the cyclist's vision, flashlight angle is too high, easy to flash to the opposite people, if the flashlight angle is low, the spot can only take care of the four or five meters distance range, if there is an unexpected situation in front of the cycling process, it will be too late to react.

For cycling lights, generally need to have these requirements.

• Distance: it is best to maintain a lighting distance of 20-30 meters.
• Brightness: keep it around 100 lumens, too dark will cause poor vision, too bright will flash to the other vehicle or pedestrian.
• Range: at least a few hours of range length, better if it is a constant current circuit (brightness will not dim with the reduction of power).
• Waterproof: in order to adapt to rainy day riding, the flashlight should preferably have a waterproof function.
• Shock resistance: to prevent damage to the circuit or poor battery contact caused by bumps in the road, resulting in the flashlight not lighting properly.

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