LED lighting

[Heavy Metal Doctor]

I know this stuff has been covered before on the other board, but I'm having trouble finding the info. I need to rewire the LED's in the bumper and under sleeper lights I got from PMD. I bought these back in the spring and didn't specify what voltage I run. If I had caught it in time, I would have returned 'em for the other voltage version, but it's been way to long.....

So the question is: What's voltage per LED and how does that translate to the voltage / batteries you run??