Just received a pair of these today, shipped from China.
They paired easily as native Zigbee devices in Homey. After setting “What’s plugged in?” to Light, on/off, dimming, adjustable white from 2700K–6500K and RGB control all work correctly. I have also grouped them successfully using the <group> app.
Unfortunately, Alexa cannot discover either the new GX53 lights or their group through the official Homey Alexa skill. This provides another example of the wider issue I am currently investigating with Athom, where existing Homey devices continue working through Alexa but newly added devices are not discovered.
Full details and comparison testing are available here:
If anyone is experiencing the same problem, please add your Homey model, OS version and affected device type to that thread or raise a support ticket with Athom. Additional reports may help establish the scale of this core integration fault.
