Better check what the manufacturer states. If it's got a medium base, 
convention dictates that the screw part is negative and the button is positive. 
I sure don't like using AC fixtures for DC circuits or appliances....

Rich Knowles
Indigo. LF38
Halifax

On 2013-01-24, at 19:50, "Fred Hazzard" <fredhazz...@spiritone.com> wrote:

Fred or others:
 
I am converting a 120 V fixture to a 12V LED light.   The new bulb screws in 
just like a 60 W bulb.  Is the center connection in the fixture the positive 
side?
 
Fred Hazzard
 
From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Frederick G 
Street
Sent: Thursday, January 24, 2013 12:08 PM
To: cnc-list@cnc-list.com
Subject: Re: Stus-List LED lights
 
It depends on the fixture -- many newer LED fixtures use LED drivers that are 
polarity-independent, and also somewhat voltage-independent.  So if your 
alternator is putting out 14.4 volts, you won't fry your 12-volt LED fixture.
 
If you're retrofitting raw LEDs into an existing fixture, then yes, they are 
definitely polarity-sensitive.
 
Read the instructions that came with the LEDs or fixture -- it should tell you.

Fred Street -- Minneapolis
S/V Oceanis (1979 C&C Landfall 38) -- on the hard in Bayfield, WI   :^(
 
On Jan 24, 2013, at 1:30 PM, Fred Hazzard <fredhazz...@spiritone.com> wrote:


I am about to wire up a new light fixture with a LED light.  Is polarity 
important with LED’s?
 
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