Yes. And also could be "with external dimmer."Is the VL ERS the arc or on board dimming?
Are you getting these for theatre use? I am assuming you want a quitter fixture with minimal noise?
They are pretty good for that, I know there are a ton of them installed at the Adrienne Arsht Center, New World Symphony and Disney Concert Hall. All spaces built for symphony so ambient noise from movers needs to be minimal.
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