You're not missing anything. LEDs that have a high CRI is a relatively new market segment, so the selection is limited, and prices are high. LEDs use the same tricks as fluorescents to reach reasonable CRI levels-- multiple phosphors with different spectra excited by the lamp's primary EM emission. So the potential exists to equal or exceed the best fluorescents. Right now, the consumer LED market is focused on replacing lamps in non critical applications, and thus tend to be rather low color temperature and only modest CRI levels. This situation should improve in the future.
"High" CRI fluorescent tubes are available in color temperatures from 3000 to 6500K, with CRIs between 80 and 90, and at reasonable prices. Right now, this is probably still a good solution for many applications. If the performance of these lamps are not adequate, halogen lamps are the only reasonable alternative. LEDs are not quite there yet.
Before you start, make sure the power to the fixture is off (not just at the switch) and, if possible, confirm with a non-contact tester (a few bucks at a hardware store).
D are the screws that need to be put through B, which is the bracket that will be attached to the ceiling box to hold up the fixture.
To see which holes, align the bracket with the holes in the fixture base. Thread screws D through the back of the bracket so the threaded ends stick out front. Which side of the bracket is the back depends on the ceiling box and whether you need the offset on the bracket sticking down or up. (It often doesn't matter.)
C are the screws that hold the bracket B to the ceiling box. Once the bracket is installed, you can connect the wires on the fixture to the wires in the ceiling box (including the ground wire to the green screw on the bracket).
Place the fixture against the ceiling with the threaded ends of D sticking through the holes. Attach with the nuts E.
The threaded tube on A is screwed into the center of the fixture, the nut is then tightened down the tube to the fixture. The remaining parts are removed. After bulbs are installed, the globe is put on, followed by the soft washer, the hard washer and the next nut. Don't overtighten or you can crack the globe. Then the decorative cap is put on and then the ball finial.
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It's like a short chandelier as shown in your example. The "semi" can range from the shade being just a couple of inches away from the ceiling to usually no more than 12" away. Bugs love them.