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Philips use a proprietary connector on their Hue Play light power leads so you cannot make up your own extension cable if you need the extension light to be further away than the standard 2m. You cannot use your own 2.1 or 2.5mm jacks to make up your own cable and so you are forced into buying Philip's own cable, at extortionate cost.
The cable works perfectly and fits snugly, no criticism there at all. But I am marking down two marks for the sheer cost of something that should cost no more than £6 tops.