If you have a wheel sucker in your riding group, the type who never takes a turn at the front, always sitting at the back keeping a nice light spin going, then fit one of these.
A 0.5 watt main LED and two more traditional LEDs light up like a bulb in a microwave; nobody will want to ride behind you for fear of staining their eyes red! In our test it was a fraction under the claimed 60 hours of run time in flashing mode.
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