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the copper strands in wire are probably cold-worked considerably during the drawing process.
the yield strength for copper is ~70Mpa annealed, and ~310Mpa for highly cold-worked copper.
its probably safe to say that the Yield strength is somewhere between those values.
18 AWG has an area of .823m*10^-6
using 190Mpa as the yield strength, the wire should be able to support 156N of weight. (35 lbs)
and failure will probably occur around 50 lbs
your wire should be fine to hold a ~20 lb light fixture.
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