There are a couple of 4k SDR monitors available from Konvision (KUM-2410W, KUM-3110) and Postium (OBM-311). Both manufacturers market them as HDR models but in reality they are not (The Konvision models are 350nits and 300nits while the Postium is 850nits). They should be extremely good SDR monitors though and can be calibrated using either Lightspace or Calman and hit all the necessary specs for SDR.
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