How do I wire LEDs in Series?

posted in: Drivers Products Constant Current


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Hello,

An LED will have Two Connections; DC Positive and DC negative.
Wiring them in series means they are wired in a line/chain.

From the Constant CURRENT Driver, there is also  DC Positive and DC negative output.  

LED#1 wires its DC Positive (typically RED) connection to the  DC Positive off the Power Supply.

Each additional LED wires its DC Positive connection to the DC Negative (typically Black or White) off the Previous LED.

When you get to the Last LED in the chain, its DC Negative connection wires back to the Power Supply's DC Negative.

When wired in series, The current through the LED will be the same, thereby ensuring all of the LEDs are driven at identical amperage.  The forward voltage (Fv) on the circuit accumulates with every LED.  

This is how Semper Fi sizes its drivers since Voltage x Amperage = Wattage.  Saying an LED is 1 Watt means nothing if you do not know the Drive current or the Forward Voltage.  If an LED has a Fv of 3.5VDC and is driven at 350ma, it is a 1.3W LED, but if the Fv is only 3.0VDC, then it is 1.1W instead.