Thus far I have been unable to find the brightness of vehicle LED rear lights in lumens, but these incandescents are 460 lm, which is about half the brightness of my headlamp on it's lowest setting (half of 1800lm).
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A mere 460lm isn't going to do the job, and neither is twice that. Cyclists have a much higher risk of injury or death in a collision, we should be allowed to use extremely bright rear lights.