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Reducing brightness of a billboard display

I have a small lighted billboard powered by a 12VDC transformer. I want to tone down the brightness of the display. If I add a couple of 1k Ohm resistors to the hot side of the circuit do I add them in series or in parallel? Will that accomplish what I'm after?
Bob
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OGR Publishing, Inc., 1310 Eastside Centre Ct, Suite 6, Mountain Home, AR 72653
800-980-OGRR (6477)
www.ogaugerr.com

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