HI,
I'm testing some High power SMD LEDs i received in the mail and getting some unexpected results. the LEDs in question have a forward voltage of 2.6 volts and I'm running 3 in series at 12 volts with a 30 ohms of resistance. my target current is 150mA. I calculated 140mA with the set up i described. when i plugged these values into my simulation software it reads 149.7mA. I'm only getting between 67mA and 75mA. I've tried several different power sources and have tested on 2 different multimeters. also, I've done two identical tests with LEDs from two separate manufactures and am at a complete loss. i have no way of explaining this. Any ideas?
I'm testing some High power SMD LEDs i received in the mail and getting some unexpected results. the LEDs in question have a forward voltage of 2.6 volts and I'm running 3 in series at 12 volts with a 30 ohms of resistance. my target current is 150mA. I calculated 140mA with the set up i described. when i plugged these values into my simulation software it reads 149.7mA. I'm only getting between 67mA and 75mA. I've tried several different power sources and have tested on 2 different multimeters. also, I've done two identical tests with LEDs from two separate manufactures and am at a complete loss. i have no way of explaining this. Any ideas?