Lights on/off at once instead of one after another

Not really, because he states it also happens with the Hue Zigbee app, in which case there’s no Hue bridge/API at all.

The problem is two-fold:

  • Homey has problems executing multiple action cards at once, especially when those cards involve switching Zigbee or Z-Wave devices (that’s why you’ll see people using workarounds like adding delays)
  • Homey doesn’t support Zigbee grouping, where you can add multiple Zigbee devices to a single Zigbee group (which allows you to switch all of those devices using a single Zigbee command).

Because the Hue bridge does support grouping, it works when you switch an entire group using the Hue bridge app.

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