Led polarity

Joined
12 Jan 2008
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Essex
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United Kingdom
We often change emergency inverters and there supplied with a new led charge indicater, this comes with a ORANGE and a PINK wire, usually on the inverters its marked P and O so easy.
However the ones being supplied soon will have + and - on.
i seem to recall a new led has one leg shorter than another, but as these have been cut and soldered thats not obvious.
Googling suggests using a multimeter and i believe JohnW once told me this too, so i quess i can try that.
Is there a reason for pink and orange wire and if so is there a standard used for whats + or -
Thanks
 
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