How can I know the polarity of bare emitter?

[psyrens]

Please bear me with the newbie question.
I have bare SSC emitters ordered to mod my ultrafire 602a1.
How can I know the polarity of bare SSC emitter?
I have some cree emitters coming too, so I wonder same question about cree too.
Thanks for any help!

 

[Nake]

Look here.

http://www.candlepowerforums.com/vb/showpost.php?p=2362832&postcount=4

 

[psyrens]

@ Nake
Thanks a lot!
Just wanted to make sure, are they all in the same direction? Left: + right -?

 

[EvilLithiumMan]

Hope Nake doesn't mind - I added a notation to his pic.

I also test my emitters first by using a 9 volt battery in series with a 10K
resistor. The resistor limits reverse current to a very safe level, but allows
enough forward current to verify the emitter works and is the correct color.

 

[psyrens]

Thanks EvilLithiumMan,
That helps a lot.