| http://www.w3.org/ns/prov#value | - In contrast, headlamps free the hands, but some runners find the light angle makes it difficult to discern trail obstacles because of the downward shine and shadows.Flashlights and headlamps vary widely in weight and brightness, and come in a variety of light sources, such as halogen, fluorescent, LED (light-emitting diodes) and conventional tungsten light bulb.
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