In a school with lots of 600 x 600 4x2ft fluorescent fittings, instead of changing to LED panels, I retain the housing and fit LED mains voltage tubes. I use a make of tube where I disconnect the ballast etc, and connect each tube to 230V. Although there are 2 pins at each end only one end is fed, the other end is a dummy connector. I think these exist for 4ft tubes as well.
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