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My hunch is that they are deliberately maximizing the apparent brightness by driving the leds with short duration, high current, pulses.
Outside North America, the range of acceptable intensity for a stop lamp is 60 to 185 candela.In North America, the acceptable range for a single-compartment stop lamp is 80 to 300 candela.
Some other types of light sources such as light-emitting diodes (LEDs), however, turn on and off extremely rapidly and would perceivably flicker if supplied with low frequency drive voltages. Perceivable flicker effects from such rapid response light sources can be reduced by increasing the PWM frequency. If the light fluctuations are sufficiently rapid, the human visual system can no longer resolve them and the eye perceives the time average intensity without flicker (see flicker fusion threshold).
To control the brightness of an LED the most efficient way is to pulse it ...
In my estimation, it is intended that these lights show up solid if viewed directly, and flickering if viewed either as your eyes dither...
My hunch is that they are ... driving the leds with short duration, high current, pulses. I have noticed that the LED lights on Cadillac SUVs are particularly annoying. I thought it was just because they turn on so quickly, but maybe I'm detecting the strobe without realizing it.
I think blue lights would be the best option for the tail lights..
The family and I were riding home the other night and I was complaining about how LED lights strobe when I look away from them. The rest of my family couldn't see it. What's going on here?^^^What my family sees.^^^What I see.It's just LED lights that strobe too. Incandescent don't. Some makes of cars are worse than others as well. Cadillac's SUVs are especially bad. The trails are strobes as well, not streaks. Do LEDs power on and off like fluorescent lights?
When she is driving at night and encounters a vehicle with these lights she says it's very difficult for her to determine the source of the lights. That she sees them all over the place.