Hello,
I'm wiring an LED array with 3w LEDs that I ordered online. Their specs give a forward voltage range of 2.2-2.4 volts, but I'm finding it's more like 2.1-2.6 when I test them. I'm wiring them in several series, with 5 per series with a 3.9 Ohm resistor, ~13v power supply, figuring about .384 amps per series.
I wanted to know if I need to test each LED individually for its voltage drop so I can group them accordingly and more or less maintain a constant total voltage drop for each series (e.g. not getting several 2.1 fV in a series or several 2.6 fV in a series). Will the brightness of the various LED series be changed if I happen to get several with a higher or lower forward voltage lumped in one series? Or will this not be a problem if the power supply stays constant and the voltage is high enough to light all of the LEDs up?
The main thing is I want to maximize/keep consistent the brightness.
Thanks for any help.
I'm wiring an LED array with 3w LEDs that I ordered online. Their specs give a forward voltage range of 2.2-2.4 volts, but I'm finding it's more like 2.1-2.6 when I test them. I'm wiring them in several series, with 5 per series with a 3.9 Ohm resistor, ~13v power supply, figuring about .384 amps per series.
I wanted to know if I need to test each LED individually for its voltage drop so I can group them accordingly and more or less maintain a constant total voltage drop for each series (e.g. not getting several 2.1 fV in a series or several 2.6 fV in a series). Will the brightness of the various LED series be changed if I happen to get several with a higher or lower forward voltage lumped in one series? Or will this not be a problem if the power supply stays constant and the voltage is high enough to light all of the LEDs up?
The main thing is I want to maximize/keep consistent the brightness.
Thanks for any help.