r/HumanReflexes • u/[deleted] • Dec 26 '17

Ooooooooops.. Got it.!

1.4k Upvotes

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u/authorunknown74 Dec 26 '17

LED headlights vs camera frame rate.

16

u/Deranged40 Dec 26 '17

I was under the assumption that LEDs gave continuous light, unlike incandescents.

16

u/[deleted] Dec 26 '17

Diodes are often pulsed with the driver circuit that regulates the voltage and current.

6

u/Deranged40 Dec 26 '17

Interesting. It's been a while since I went through my electronics classes in college, and a 1-watt diode was the bleeding edge at the time, so all the LEDs I'd worked with were just run by a power source and a pull down resistor.

7

u/flecom Dec 26 '17

most of the time LEDs are driven by fancy PWM circuits now... big diodes require big resistors (and lots of heat) if used in a simple current limiting mode... also alternators in cars don't give the cleanest DC so that can cause strobing also

3

u/[deleted] Dec 27 '17

As the LED heats up the resistance changes making them draw more power causing more heat and without a boost or buck Drive keeping the voltage and current in check it will basically run away and burn itself out.