LEDs are a current device. Thy are not a voltage device like a light bulb. The voltage given is just a guess, not temperature stable, and changes from one LED to another. That is why we drive LEDs with current.

 

LEDs are a current device. Thy are not a voltage device like a light bulb. The voltage given is just a guess, not temperature stable, and changes from one LED to another. That is why we drive LEDs with current.

Considering that there is an inverse twelfth-power relationship between voltage and filament lamp life, and that most failures happen with the inrush current, perhaps it would have been better if we had driven them with constant current?

 

Because it concern course work

If I was the teacher, I would ask some hard questions to see if you know how it works.