Hello,

Im working on a project where I want check from which voltage / current  the LED´s beginning to emit photons.

Im a professional electronic technician and this is a private project, but Im thinking about making a public study paper, so that others can use the results.

A LED light up from already 2-15mA what the human eyes can see. But already before the eyes can see the light, the LED is emitting photons. And this is my target, I want to measure as exactly as possible.

My problem is, that I can only measure voltages and currents. But I dont have the knowledge about photonic to calculate the (theoretic) emitted photons.

To measure the photon emission, I would use 4 types of sensors, LDR, photodiode, phototransistor and a reverse poled LED.

I were glad if you can tell me how to calculate the emitted photons.

For the LEDs which I will use in the experiments, I will use blue and red LEDs.

How for a soon answer, 

thanks

Petr

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