I found the led (pics can be found in attachments) in auto power failure light.
I was surprised to see how bright it was. I measured the voltage with a multi-meter. It was 3. something. I was surprised to see how a 3 volt light can perform so well. I also guess that the metal on its back is heatsink.
Now my questions are
1) What knid of LED is this?
2) How much does it cost?
3) Is it available in different colors?
4) How much current does it take to drive it?
5) Can it be driven from an arduino directly?
And by the way can somebody tell me how to post pictures directly instead of posting them as attachments?
Thanks in advance.