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Natural light has a yellowish tint (the suns yellow if you haven't noticed) hence the 2700-3000K recommendation. 4000K will look like a commercial space -- the colour temperature is too high for general lounging. 5000K bulbs would be more specialized lighting that you wouldn't find in a traditional home so skip that altogether.
If anything you should be more concerned with CRI: "Colour Rendering Index" which is equally as important as colour temperature.
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