Yeelight's Arwen, Mercury and Meteor series and Gosund's round models replace an ordinary ceiling light entirely: the unit is fixed to the ceiling and controlled with an app or a remote. The number in the model name refers to the diameter - Yeelight's 450, 550 and 600 are millimetres, while Gosund's lights are marked in centimetres - so measure the room and your current fitting first. RGBCW means that both the colour and the shade of white can be adjusted, and the MercuryE C300, for example, also has a motion sensor.
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Yeelight's Arwen, Mercury and Meteor series and Gosund's round models replace an ordinary ceiling light entirely: the unit is fixed to the ceiling and controlled with an app or a remote. The number in the model name refers to the diameter - Yeelight's 450, 550 and 600 are millimetres, while Gosund's lights are marked in centimetres - so measure the room and your current fitting first. RGBCW means that both the colour and the shade of white can be adjusted, and the MercuryE C300, for example, also has a motion sensor.