Experience with GRAU Falling Sun (or GRAU lights) via Matter or Casambi on Homey Pro?

Devices
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Hi everyone,

I’m currently evaluating the GRAU Falling Sun Trace pendant light for a dining area and would like to integrate it into a Homey Pro (2023) based setup.

Before making a purchase, I’m trying to understand whether there are real-world experiences with integrating GRAU luminaires into Homey, especially via Matter or Casambi.

Context

  • Main automation platform: Homey Pro (Matter controller)

  • User interfaces: Apple HomeKit (Siri) and Philips Hue

  • Goal: local, long-term maintainable integration (no cloud dependency)

  • The Falling Sun uses Sunset Dimming, meaning brightness and color temperature are internally coupled (brightness is the only external control parameter)

What GRAU told me

  • They have installed Matter modules for a small number of customers on request

  • However, they currently have no concrete feedback or documented experience on how well this works in practice

  • Matter and Casambi cannot be used in parallel (single control module)

  • Brightness and color temperature cannot be controlled separately anyway

My questions to the community

  • Has anyone here successfully integrated GRAU lights with Homey Pro?

  • Specifically:

    • via Matter (as a dimmable light)

    • or via Casambi (using the Casambi Controller app or a gateway)?

  • If using Matter:

    • Does basic dimming work reliably?

    • Any issues with pairing, stability, or state feedback?

  • If using Casambi:

    • How stable is the integration with Homey in daily use?

    • Any limitations worth knowing?

At this point I’m mainly trying to decide whether Matter is already a safe choice in practice, or whether Casambi is currently the more reliable option despite being proprietary.

Any real-world feedback would be highly appreciated.

Thanks in advance!