Amazon Alexa (Echo) smart home kit for lighting
A compatible Amazon Alexa (Echo) starter kit for lighting: 2 devices plus 1 hub/bridge, about $108. Every pairing checked against manufacturer docs.
Devices
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Nanoleaf Essentials Matter A19 Smart Bulb $20
Matter over Thread: 'Matter compatible hub and Thread Border Router required'; compatible border routers are 'Matter hubs that double as Thread Border Routers' (or Nanoleaf Shapes, Lines and Elements). Bluetooth only for Nanoleaf app control. Home Assistant via Matter (HA is a Matter controller with a Thread border router).
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Lutron Caseta Diva Smart Dimmer Switch $88
Needs: vendor hub
Lutron ClearConnect radio; every integration runs through the Lutron Smart Hub ('The smart hub contains Apple Home technology'). 'No neutral wire required.' Home Assistant: official local HA integration exists but was not verified in this pass.
Hubs and bridges you also need
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Lutron Caseta Smart Hub —
Required as: vendor hub
Required gateway for every Caseta integration: 'The smart hub (formerly smart bridge) contains Apple Home technology'; also the path to Alexa, Google Assistant and SmartThings. Speaks Lutron ClearConnect to the switches; no Matter, no Thread. Sold standalone or in Diva kits; price not on the fetched pages.
Total
$108
Excludes 1 item we could not price from a manufacturer or retailer page.