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Dimming For LED Lighting


  • There are two types of Phase Dimming: Leading Edge Dimming and Trailing Edge Dimming
  • Leading Edge dimming is sometimes called Forward Phase or TRIAC dimming
  • Trailing Edge dimming is sometimes called Reverse Phase or Electronic Low Voltage Dimming.
  • There is a massive installed base of phase dimmers which is why they are so popular.
  • There are no additional wires on a Phase Dimming driver. The dimmer is wired in line with the output of the driver.
  • Phase dimming is only available in 120V input


  • This dimming type is used in most new construction and commercial applications.
  • There are extra wires (usually grey and purple) on the driver that hook up to the 0-10V dimmer.
  • 9V is the maximum light level and 1V is the minimum light level.
  • 0-10V dimming is available in universal 120V-277V input.

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The staff at Spark Lighting was very knowledgeable and professional when providing lighting solutions for our property. They provided excellent LED solutions and explained cost savings in a detailed manner. The installation of the product was seamless and without error. They were a pleasure to work with and they know their stuff!

Jim DeGeorge