(Light-emitting diode) is a new type of light source developed and produced. It has the characteristics of low power consumption (current is only ~), high brightness (light intensity can reach tens of thousands), small size (the smallest diameter can reach up to 10,000), light weight (one light emitting diode) The diode weighs only a few tenths of a gram) and has a long life (average life span is 10,000 hours). Now they are gradually replacing incandescent lamps and low-voltage tungsten halogen lamps in making road traffic signals
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