Help with reverse engineering an LED driving circuit
The lower input port dims (or turns off) the LED when high. 

The higher current (assuming the input is less than 0.5V or so) is set by R7 only. Whatever that port is used for, it can only dim the LED. 

So if you want the nominal maximum current to be 60mA, you need about 1.75 ohms for R7. 

(there is a small, about +4% effect from the resistor divider, which I am ignoring, so pick a bit higher value for R7 - the tolerance of the chip Vref is about +/-10% )