Wet or icy roads, especially roads covered with a thin layer of black ice reflect almost all light forward. The rest is wasted (other than allowing other road users to see where you are). That portion reflected back toward you is the only part that does you any good. Road surfaces normally reflect light in all directions, including back toward the source. This means we simply need more light to see well. The pupils can no longer dilate to the degree it did in youth. As we age, the lens of our eyes grow stiffer, and less elastic. What is adequate light for someone in their twenties is very likely inadequate for someone over 40. On the other hand, if your winter has much rain, there is nothing darker than a wet road at night, and the bigger the lights the better. Even a wimpy light provides enough illumination for snow covered trails and roads. Remember, that if you ride the roads, you need brighter lights than on the trail, because roads tend to be cleared of snow and ice, making the surface darker, taking more light to illuminate it Snow is very bright. You want to be sure that your choice works in the cold. Lights aren’t really a winter cycling issue, but since it is dark longer in winter, you tend to need bicycle lights in the winter.
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