[cardmagic]

My Kuna security cameras turn lights on at night and off at sun-up. My Nest already has presence detection and adjusts temps based on that.

More importantly, I didn't buy a Kuna for lights on and off with the sun, nor a Nest for presence detection, so I still don't see these functions as killer apps for HA.

[ryukafalz]

Can you use the Nest's presence detection to turn your lights off when there's nobody home?

One of the "killer apps" for HA is connecting different silo'd smart devices.

[semi-extrinsic]

My $8 "dumb" LED outdoor bulbs have sunrise/sunset sensors built in...

[oh_sigh]

Can you have them turn on 30 mins before sunset?

[semi-extrinsic]

There is usually a screw to adjust at what light level they turn on. So I suppose you could hit the 30 min. mark with some trial and error. But why would you?

[lttlrck]

You can get an astronomical light switch that replaces the manual light switch that can do that and more based around actual sunrise/sunset time for $30 - it’s a little pricey but they just work.

[agentdrtran]

All of my Zigbee stuff 'just works' as well and is under $30/bulb for basic lights.

[brewdad]

Yes but I have 4 bulbs outdoors controlled by my $27 switch. Bulbs will fail over time, especially when exposed to the elements and seasonal temperature swings. I can set my lights to turn on off at a fixed time relative to sunset/rise or randomize it +- 30 mins. All with a switch that I bought at a big box store 10 years ago.

[zild3d]

that would definitely require them to not be "dumb" anymore.

A simple sunset/sunrise detector can be had from a cheap photo-resistor. 30 minutes prior to sunset sounds like it needs at least a micro controller with a real time clock and a lookup table with sunset times