Which confidence level and parameters for face recognizer?

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I'm developing a facial recognition app for android. I have been testing both the Eigenface and LBP recognizers.

Now I'm wondering which confidence levels are good for these recognizers, with the eigenfaces I get around 10000 while with the LBP I'm only getting numbers of around 30. So is there some kind of guideline for these confidence levels?

I know you also can set parameters for Eigenfaces, the number of components, however this doesn't seem to have much influence on my results. Is the number of components just the number of training images being used?

And for the LBP are there any recommended parameters or is it best to leave them to default?