Your set is fully HDR capable and therefore there is no need to use (nor should you attempt to use) target luminance. Those settings are for non-HDR sets and PJs.Iv recently paired an Oppo 203 with my Samaung KS9800 tv that can almost hit the peak brightness of 1600 or so nits. My question is what should I set the HDR Target Luminance to... should it be to 1600 nits or less? Im not sure what exactly is the purpose of this setting. Tia!