With the Homey Zigbee2MQTT app, you can import devices from a Zigbee2MQTT system (standalone, Home Assistant, etc.) and use them with Homey. As far as I know, not all devices are supported, but smart lights work perfectly.
For more information and specific questions about the Homey Zigbee2MQTT app, please visit the corresponding app topic → [APP][Pro] Zigbee2MQTT - Use Zigbee devices via MQTT
