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.