Hi Ken,
I'm going to assume this is a "low voltage" application (<50 Vdc) or else it
gets kinda complicated.
I'm also assuming that the "non-plated mounting hole" doesn't have hardware
(ie a screw, etc) in it, or else you'd have to clear that instead of the
hole.  Sorry for stating the obvious.

1). min. distance between a surface mount LED pad and a non-plated mounting
hole.
External conductor, uncoated:  (.025" + .016" + position tolerance of hole)
over the max hole dia.
External conductor, coated:  (.005" + .016" + position tolerance of hole)
over the max hole dia.

2). min. distance between a surface mount LED pad and a plated mounting hole
(pad edge to annular ring edge)
External conductor, uncoated:  (.025" + position tolerance of hole) over the
max hole dia.
External conductor, coated:  (.005" + position tolerance of hole) over the
max hole dia.

3). min. distance between a plated mounting hole and a non-plated mounting
hole.
Treating the "plated mounting hole" as a conductor, same as answer to #1,
but add the position tolerance of the second hole.

4). min. distance between 2 surface mount pads.
External conductor, uncoated:  .025".
External conductor, coated:  .005", although not terribly practical from an
assembly standpoint (call me old fashioned).

There are a ton of other what ifs? that could easily change these answers,
but these numbers answer your question as best I can with limited
information.

Regards,
Mike

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