[Healeys] LED polarity

[Mike Garvey]

I will echo Rick's remark; the forward voltage drop across an LED is about 3.3 or 3.4 volts. Maybe there are several (7?) LEDs in series or maybe a resistor in series as Rick suggests.  If the replacement power supply is not an EXACT replacement, perhaps including the resistor, I'd proceed with great caution.
Mike 
 
From: Richard Ewald [mailto:richard.ewald at gmail.com] 
Sent: Monday, February 29, 2016 1:02 PM
To: Mike Garvey
Cc: Austin Healey
Subject: Re: [Healeys] LED polarity
 
The part that bothers me is the 24V.  That is way, more voltage than an LED is supposed to run on.  There needs to be a dropping resistor in the circuit or the LEDs will go up in smoke.
Rick
 
On Mon, Feb 29, 2016 at 9:49 AM, Mike Garvey <r3m1g4 at verizon.net> wrote:
Some LEDs have built-in steering diodes (as in a full wave bridge rectifier) and will run on either polarity.  In theory, this should allow them to run on AC supplies as well.
Mike
 
From: Healeys [mailto:healeys-bounces at autox.team.net] On Behalf Of Michael Oritt
Sent: Monday, February 29, 2016 12:14 PM
To: Austin Healey
Subject: [Healeys] LED polarity
 
This really is not a car-related question though I guess we could make it into one:
 
I have some 24VDC outdoor LED lighting and the wall-plug type transformer is defective.  I cannot determine which of the two fine wires that run to the appliance (LED's) is positive.  I can find a replacement transformer online. 
 
Here's the question:  I understand that LEDs are polarity-sensitive and if I wire them up backwards will I destroy the LEDs or can I simply reverse the polarity?
 
Best--Michael Oritt

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