Passing through mountain biking until the city bike, your two wheels must be equipped obligatorily with 2 lights: a light yellow or white at the front and a red light to the rear. Several solutions exist to be seen and to see bike. Here is a method to choose his fire according to his need.
Choose a fire according to the brightness
What light power to choose?
The lumen (lm) is the unit of measure of the effectiveness of the light, which is the amount of energy emitted by a source in the form of light radiation. As the lux, it also measures the effectiveness of the light but per unit area.