Can this be used outdoors on covered porch
This fixture is for indoor use only.

Can it be used 220 voltage
All of our fixtures have a voltage of 120.

does this have it's own on off switch?
This light is designed to be hardwired to an existing switch.

How many inches away from the wall does the globe start?
The globe begins roughly 2.5" from the wall.

What is the diameter of the silver piece that mounts on the wall?
The diameter of the silver piece that mounts to the wall is 5 inches.

what is the fitter opening
The fitter opening is 2.75 inches.

Is this light fixture ok to use in damp locations?
Outside of the entry door would be considered a wet location and this is not rate for that. Only damp for a bathroom above or next to a mirror where direct water would not come in contact with the fixture.

How far does it jut out from the wall?
from the wall to the end of the glass shade is 8 inches.

Can this be mounted with the bulb and globe facing up instead of down?
Yes, this can be mounted with the bulb and globe facing up.