There's 2 issues with the Ikea bulbs, there is no green so marketing these as rgb is a cruel joke, secondly they only report color in xy, they do not support hue and saturation.
Rgb -> xy and rgb <-> hsv work well, however I've not seen any xy -> rgb formulas that can survive rgb -> xy -> rgb with any level of accuracy, so I've given up any attempt to support these at this time.
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