34000mcd (http://en.wikipedia.org/wiki/Candela) sounds really bright and really impressive, and they are fairly bright when viewed straight on...but it's not all that.
These are what I used in my toobz...
http://www.philipslumileds.com/pdfs/DS05.pdf
70mA drive current with a 1/2 power viewing angle of 90 degrees.
They aren't the Luxeon super bright, multi-watt, power LEDs, but they do well.
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