Bicycle taillights were among the first products in which conventional light bulbs were replaced by light-emitting diodes. The diodes’ relatively low power consumption allowed manufacturers to use smaller and lighter batteries.

At first, L.E.D. taillights suffered from being somewhat dim. But that is not a limitation of the DiNotte Tail Light (www.dinottelighting.com). The lamp, which vaguely resembles a short, fat lipstick tube, holds a three-watt L.E.D., making it more powerful than many bicycle headlights.

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On full power, the light projects a large beam of red light well behind the bicycle. The effect is a bit like carrying a red emergency flare.