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Hey Fred. Not sure what a shunted endcap is, but I used the ones sold at reefgeek. I imagine they'd work fine, as you just stick the wire in the end cap.
So grounding, do you have the ballasts yet? I used icecap on my setup, and they were wired for a grounded plug (3 wire). Check to see what your ballasts say. Also, you'll want to ground the reflectors, as even though they clip to the insulated bulbs, the bulbs will induce an electrical potential into them. This is not inherently dangerous, but the way mine were setup, I would often brush my arm against the reflector while feeding the fish (with my hand in the water), and I would notice a distinct buzz. Again, not going to electrocute you, but a bit uncomfortable. I just tied into the same ground wire coming out of the ballast and used some alligator clips to clip onto the ballasts, as this makes it real easy to take them out and clean (as opposed to unbolting or clipping some wire).
Finally, the AC/DC converters should work fine as long as the fans are indeed rated at under the 1.2A. After you wire it up, just test it for a little while. Not sure how it would fail if you over-run the converter, but I imagine over heating would be the prime issue, so run it for an hour or so before you install it to see how it works out.
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