Cygolite's Streak 310 puts versatility, power, and loads of light in a tiny package. With 310 lumens you'll have plenty of light for commuting and road rides. It features a unique SteadyPulse mode that alerts night time motorists with pulses of light while still constantly lighting your path and a DayLightning mode that creates super-visible flashes for enhanced visibility during the day. It also features high, medium, and low modes to customize your output and run times. Plus, the tool-free handlebar mount makes installation simple.
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I don't ride at night but I have tested it at night and it gives bright illumination. My primary use is day-time. It has a strobe feature for day use but I use the low beam instead because the battery last longer and light is highly visible.