setting values and percentages

[richard]

you will find that the led 'brightness' will not be a linear progression over the full 4096 steps anyway . its probably easier to have a finite number of brightness levels in a lookup table (how many brightness levels do you think the average person could differentiate between?)
try starting with 20 levels [ 0=off ,( and 18 between ) , 4095=full on] , those in between levels could be established by observation

[Demon]

Wouldn't he be better just staying with 255? Or am I missing something obvious?

Robert