For anyone looking to connect Ledvance Wifi lights (and possibly plugs) to Homey, I have found a workaround. It is tested successfully on Ledvance Wifi Sun@Home Platon Plus light panel.
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Connect the Ledvance app (Smart+ Wifi) as per instructions on the light source
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Install Amazon Alexa app on your phone. Create an account if you do not have one. You do not need to own any Amazon devices.
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In the Amazon App, add new device, choose Smart Light Light (Smart Life Plug should work for plugs). Connect to the Ledvnace/Smart Life account from step 1.
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Install https://homey.app/no-no/app/com.amazon.alexa/Amazon-Alexa/ on your Homey. Configure the app and connect to the Amazon account from step 2.
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Add a new device on your Homey. Choose Amazon Alexa som produsent. Choose Smart Light at the bottom as type (or Smart Plug).
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Enjoy!
Brightness and color control works as expected. There is a slight delay (1-3 seconds) on commands, as they have to traverse both the Amazon cloud and the Ledvance Cloud.