• One nice rear light is enough. Two can be good if you want other cars and cyclists to see you and think 'that person has one too many rear lights' which I guess is something.

    Nice bike btw!

  • Two also has redundancy built in.

  • I have two for a few reasons.

    1. An always on rear light is far better for determining the speed and direction of vehicle. Yet a blinking rear light is what people notice when they aren't paying attention as it grabs attention. Two means one on each mode providing the best of both worlds.
    2. I've had rear lights fall off in the past, usually as a result of a violent impact like a severe pot hole. Two means I'm hoping one always stays on.
    3. Having 2 which operate in different modes means that were I to neglect to charge (they need charging very seldom) then 1 of the two has significantly more battery left than the other.
    4. They're at subtly different angles, the blinky one is angled higher so that when a vehicle gets too close the light gets bright as the driver moves into the focus path of the light optics.

    Given that these lights are extremely cheap, quite bright, take standard AAA batteries, and only look large in profile (they're vertically mounted and fit within the front profile of the seat post)... it's just a no-brainer to run two.

    I may overthink this stuff... but it's dirt cheap, weighs nothing, and I feel it is a better thing than having a single nicer (read: more expensive) rear light.

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