I have a project where I made a series of high power Osram OSLON blue leds using custom boards on aluminium PCB. I just put 16 LEDs in series and joined them to an appropriate constant current supply. They all light up well and the currrent/voltages all seems to what I expected when measured. However, when turned off the LEDs have a significant glow and the supply has a significant voltage across the circuit.
Do I need to improve my circuit so that it safely discharges? I take it that this would mean putting a resistor somewhere?
Thanks for your help!