Hi thanks for the information.when built this pot I did burn up a few leds then added a 470 resistor to it which solved the problem .This pot going to be used for testing leds for brightness.what I did find out was the100k worked fine for me . the problem I was having is using resistors from1k-220 ohms which were to bright and bought resistors trying to find out which way to go and went online found resistance calculators and i couldn¡¯t figure it¡¯s light level.nick showed some of brightness levels he was working on which I trying to achieve .then someone suggested a pot .
