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I have a very limited understanding of how current works in parallel or in series. I am trying to connect a pair of LEDs to a constant current power supply (1200ma) in which the power supply automatically adjusts the output voltage according to the current draw.

Which (if any) will result in a brighter output? Series or parallel configuration?

The LEDs are Cree XP-G2 1A R5 that can handle 1.5A of current. Of course I don't want to max this out because it will create too much heat. I have tried both setups and measured the amp draw maxed at 1200ma but I can't tell which is brighter. Does it even matter in my case?

Any help would be greatly appreciated.

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2 Answers 2

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You should connect them in series because:

  • if diodes are connected in series - exactly the same current is flowing
  • current will be 1200mA, because it does not split like in parallel

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In series - circuit will need higher voltage to reach 1200mA on these leds, because in series voltage (not current) splits.

enter image description here

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Series connected since power supply voltage is adjustable but current source has 1200 mA limit. To draw current required by two series connected LED voltage needs to be increased.

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