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Motorcycle headlamp modulator
A motorcycle headlamp modulator (or simply headlamp modulator) is an accessory device that oscillates the intensity of a motorcycle headlamp at 240 ±40 cycles per minute (~4 Hz)〔(FMVSS 108 S7.9.4 )〕 between approximately 20% and 100% of full intensity. The headlight operates at full intensity 50-70% of the time.〔(FMVSS 108 S7.9.4 )〕 United States and Canadian regulations require headlight modulators to include a light sensor that disables modulation when the ambient light level drops below a certain point. When this happens, the headlamps burn steadily.
==Purpose==
Motorcycles in the United States since 1978 have been wired so as to operate the low-beam headlamp whenever the engine is running. This is not required by any federal regulation but rather is a matter of voluntary industry policy. However, as increasing numbers of vehicles are equipped with daytime running lights, daytime-illuminated motorcycle headlamp may no longer provide a significant conspicuity benefit. Some motorcyclists install headlamp modulators in the belief they increase motorcycle conspicuity in traffic.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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