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Thread: What happened to 3-wire phase dimming?

  1. #1
    Junior Member
    Join Date
    Mar 2019
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    4

    What happened to 3-wire phase dimming?

    I was specifying some LED lighting and noticed that the manufacturer, who used to provide a Lutron 3-wire phase dimming driver as an option, no longer does. They said that the driver is no longer available from Lutron, and the suggestion was to use 2-wire phase dimming instead.

    The fixture I was looking at was USAI B3RW, which used to offer a -D4 driver option. That looked like this, having a distinct “DL” or “dimmed hot” wire in addition to the “L” or “switched hot”. I was planning on mixing that with compatible RRD-F6AN-DV dimmers.

    With the -D3 2-wire phase dimming driver, I’d be using RRD-6NA dimmers instead, with “dimmed hot” only. But I found the apparent discontinuance of the 3-wire phase driver somewhat surprising, because to me, it’s electrically cleaner to separate power (L) from control signal (DL).

    Does anyone know what happened to the 3-wire phase dimming system? Lutron’s site doesn’t seem to mention it anywhere since the latest driver revamp.

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  3. #2
    Senior Member
    Join Date
    Oct 2013
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    They have been phasing them out for some time. My guess is that it is a low-margin line for them and others make an acceptable product. I've even seen references to Advance and Sylvania in some of their literature. That's a hard 180 from the fire an brimstone lectures we used to get about the world ending if we didn't use Lutron ballast/drivers with Lutron dimmers.
    LED, Incorporated
    Raleigh, NC 27614

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  5. #3
    Junior Member
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    Sep 2019
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    Agreed..I have been hearing it since a long time now..Thats an obvious thing now

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