I have a reading lamp from IKEA. It has a bright LED. Too bright for my taste. So I inspected it and it is composed of a DC power supply unit that outputs 7V and a maximum of 3W. The LED unit is saying 1.5W.
My college memories tell me that this means that the LED is doing 214 mA at an equivalent of 32.7 ohms.
I am thinking to dim the LED using a potentiometer but I need to understand what resistance range should the right potentiometer have. If I choose a wide range the usable range within will be too short and I would have a hard time setting the desired light, choosing it too narrow it will not dim enough. I guess. Please correct any assumption that I make if needed.
Furthermore I remember that current vs light given by a LED is heavily non-linear. That means that if I manage to cut the current in half the light will not be half but probably 1/4 or even 1/5. If I'm not wrong again.
Considering that I would choose a potentiometer with a maximum resistance of the same equivalent resistance of the LED would that be a good choice for me?
I am aware this question might require editing and please provide comments that would help me pen the question better.