pendant lighting over sink

My kitchen has 7ft 2inch ceiling. The ceiling to the counter top is 4ft. The middle of the window is 2ft. I have been trying to figure out what size pendant lighting to put at my kitchen sink. I would like an adjustable rod. My question is the shade I don't want to go to big or to small. I am looking for some input on the size of the shade on the pendant without be too big or too small. The measurements seem a bit confusing as to how big the shades are on some specifications. Any input

Thanks so much

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