How can LEDs be used to detect light?

[nymphetamine001]

awesome



[KennyCieux]

what is the direction of the current flow? The conventional way or the opposite?

[DonOfIstSarajevo]

THIS IS FAKE !!!

[AHProduction1214]

very good job.Come and join us.

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[fennecfanatic]

2:30 Happy to help with the theory there. The reason is because the LED is not producing current. Rather, the presence of light of the same wavelength range as the LED produces causes the resistivity to change, essentially deadening the diode effect that normally prevents current from flowing that direction.

[gnomadrocketry]

A white LED should probably not be used for this purpose as a white LED is actually (internally) a blue LED that shines on a a phosphorescent material that emits multi-spectral light.

A single color LED with a clear case is generally preferred for this application, and LEDs are most sensitive to the color they emit when supplied with power.

[SurfOrDie1]

good video and exploration

[sxdemon]

thanks to photons!

[HMInnovations]

Could you not use a very large aray of LED's to collect energy from the sun? and charge equipment?

[Dark0Lord7]

@HMInnovations In theory yes, but LEDs are too expensive, and generate less voltage than a solar cell.

[subsonicnat]

Hi wondered if this could be used on a Transistor curcuit to Amplify through several Transistors to boost voltage.. Just a Thought.  Good though. Thank you.

[jollino]

The amplifier would need to be powered, and at that point it'd be easier to use that same power supply for your circuit. :)

I also doubt that an array of LEDs would be able to provide enough power for anything. Keep in mind that the fact that you get voltage across the terminals doesn't necessarily mean that you have enough current to run something else.

[rroge5]

test the amps coming out of it when its short circuited. i believe it wil be a number of nanovolts

[definitionofis]

I use this LED sun tracker to run my

solar panel tracker:

redrok com/electron.htm

[JHsadler]

ar clever but are you shure that its a normal led?

[jollino]

Absolutely positive. It works with any led, albeit different leds will give different values.

[firedude201234]

@jollino

fuck.....im trying this out right now lol

[ORMEntertainment]

the exactly opposite of photovoltaic solarmodules. an led is a small silicium cube with 2 charged sides. negative electrones and positive "holes". If you put an current on it, the negatives fusing with the holes and escape as an photon (light) Like a solarmodule using a silicium plate. if photons hit the silicium, they split into negatives and positives, now you simply connect both sides and you have a circuit. I think if you connect a solarmodule to a poweline they ll be the brightest LED ever.

[hexinteractive]

Thanks for explaining