Installing Pendant light which came with 3 clear wires and 1 copper/bare wire
A pendant light needs 4 wires: 


Hot
Neutral
Ground for the dangling lamp
Ground for the box cover


Two of them go to metal contact points in the bulb socket. If one of them is easier to touch than the other, that should be neutral. 

Honestly, I'd say if the accompanying documentation or online docs do not tell how to hook it up, then it goes back to the store/into the trash.  I would question the UL or CE listing, as I doubt they'd list a fixture with no clear way to hook it up.  I can only imagine they expect a qualified electrician to beep it out.  Well, digital voltmeters are $10 at Sears if cost is a factor - for a world-class one, Fluke.