I have installed 6 of these so far, two double ended with shunted tombstones, and four single ended with non-shunted tombstones. Very easy, and all six worked flawlessly. If all 20 bulb sets work, I will come back and give them 7 stars.One thing not in the instructions - when using single ended you need to put install the light with the blue collar end at powered tombstone.
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