I built a minimal LED driver circuit using a LM317LZ and a 12 Ohm resistor between OUT and ADJ (identical to e.g. Understanding this LM317 LED Driver circuit). According to the datasheet this should give 100 mA output current but in fact it it is around 60 mA. Input voltage is about 40 V, the LED is a COB LEB which has aprox. 32 V forward voltage at 100 mA. The voltage drop across the resistor is 0.55 V. What am I doing wrong?