DRL LEDs running a sequence.

[nickpike]

Hi, I hope I explain this so you understand.
I have seen youtube reviews where they show the LEDs on the DLR lights running a sequence, that is the first top LED illuminates , and then the second comes on, and so forth so that all eventually illuminate. How does that happen?
Nick

 

[Nikgen]

It's the frequency of the LED's versus the frame rate of the camera recording it. You will not be able to see this in person with the naked eye.

 

[nickpike]

Would they all flash together, so you would see them all off, then all on, rinse and repeat through a camera. I'm seeing a sort of 'wave front' effect, like a light string getting longer.

Nick

 

[Nikgen]

Would they all flash together, so you would see them all off, then all on, rinse and repeat through a camera. I'm seeing a sort of 'wave front' effect, like a light string getting longer.

Nick

Depending on how they are wired, they can look like they are flashing together or moving/chasing. Shutter speed and frame rate of the camera will affect what effect you see on video (especially on cameras using CMOS sensors).

 

[MikeyTG]

You get more light out of an LED at a certain wattage by running it with short high power pulses instead of a lower continuous power. They probably sequence the LEDs to make for a more even load on whatever power supply is running them.

In any case, they are pulsed rapidly so your eye cannot see the pulses, but they are revealed when recorded via a video recorder, which takes a rapid series of still images. Since the two rates (pulses vs frame rate) are different you can also see that they are sequenced.