• Not cobblers. I've done DD several times, and visibility depends a lot on the weather, and how close the ride night is to the actual full moon. On a clear night with a proper full moon, you'll be ok if your front light just throws some sort of a beam. I've seen plenty of people riding by the light of their mate's lights. Not ideal, but people do it...

    I agree with moth that not many hi-power lights can last 6 hours on continuous burn, either. On top of that, when they are in full effect, some of them are so powerful that they can actually annoy other riders.

    I'm using any old full-size LED rear, and a decent LED front, and packing one set of spare batteries. Most LED rears are plenty bright enough. The most dangerous part is leaving town on a Saturday night in traffic, and that's the lighting I normally use in London night-riding.

    Not too sure about being a cyclist and not having any lights you can lay your hands on. Strange philosophy. You can get a (LED) beam front and rear LED from Tescos, or any boot fair for not much more than inner-tube money.

    As others have said, a beam is important for map-reading, sign reading, repairs, seeing the ground in the dark, wooded sections. Got to be a beam at the front.

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