Ref.CE-P467 04/09

5. Connection among multiple LEDs (Serial connection is recommended.)

When multiple units of identical LED products are connected, a serial connection makes the

current through LEDs uniform. We recommend serial connections with the object of stable

light-emitting output and reliability.

When they are connected in parallel, you need to consider variations in the forward voltage

among the LEDs. To apply even current to each LED connected in parallel and which has

different properties on forward voltage, implementation of measures is required such that an

appropriate current-regulation resistor for the actual temperature conditions is connected to each

LED in serial.