fungus:
KirAsh4:
I just know that when I'm fading an LED up to max then down to 0 again, it just seems to stay near it's max intensity longer than any other range. I know it's not, but the light intensity makes it appear that way.No, it probably is. Light output from a LED isn't linear.
I think we're talking about PWM driving an LED, so the average light output is theoretically linear in the PWM duty-cycle. Self-heating reduces efficiency somewhat so linearity is best at lower output powers. The human eye has no chance of detecting this degree of non-linearity since the response curve is roughly logarithmic over many orders of magnitude (5 or so)