Light-as-a-service could work... where you outsource all your light switches to an AWS lambda function, and turn them on/off via a subscription based "AI Powered Easy To Use App!"
AI powered of course in that it knows when you've entered and exited a room, unlike dumb humans who have problems with this... or something.
This is actually sounding like a perfect startup proposal.
The startup puts a full suite of smart bulbs/switches in your house for free, and then charges you a monthly subscription fee (flat fee + a per-candela-second rate). Sure, there's a large up-front cost for the startup followed by a long amortization period before you start actually making money, but that's what VC is for.
AI powered of course in that it knows when you've entered and exited a room, unlike dumb humans who have problems with this... or something.