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Home Assistant is open source home automation that puts local control and privacy first. Powered by a worldwide community of tinkerers and DIY enthusiasts. Perfect to run on a Raspberry Pi or a local server. Available for free at home-assistant.io

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Circadian vs “dim to warm” (self.homeassistant)

submitted 1 year ago by AA5B to c/homeassistant

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I just read a great article about a company wanting to do Circadian lighting on the International Space Station! It was very inspiring, so now I want to look into automating that. Up until now, my priority has been smart switches (both Zigbee and Z-Wave) and voice control, but I also have an automation to dim when it’s bed time.

Can anyone compare Circadian vs “dim to warm”, by how happy you are with results, cost, complexity? I guess I’d have to get all new bulbs either way, but I’d have to rewire and reconfigure switches for smart bulbs to do Circadian and I’d have to actively automate, vs “dim to warm” would just do it

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[–] wheels 3 points 1 year ago (1 children)

I have Hue lamps around the house that are daylight temperature in the day and turn warm and dim in the evening on a schedule. Is this what you mean by circadian, or is it something else?

[–] AA5B 5 points 1 year ago* (last edited 1 year ago) (2 children)

Yes.

A smart bulb with controllable color temperature can be configured to be whiter in the day and warmer into the evening and night. The idea is to better mimic the sun to reinforce our circadian rhythm, and improve sleep. I believe Home Assistant has at least two integrations that can control lights this way.
vs recently there are new dimmable LEDs that automatically change to whiter when bright and warmer when dim, similar to the natural behavior of incandescent bulbs.

These are two different approaches that probably have very similar results (since I already have an automation to dim as it gets later)

[–] [email protected] 1 points 1 year ago (1 children)

there are new dimmable LEDs that automatically change to whiter when bright and warmer when dim

I love the idea of these bulbs. I'm using the adaptive lighting component so my bulbs' temperature and brightness are always correlated anyway. For light fixtures with more than one bulb, a single smart dimmer could replace a whole zigbee light group.

However, are there any bulbs on the market yet with a good temperature range? So far, the only ones I've been able to find are Philips Warm Glow lamps that only go from 2200K to 2700K, which is way too warm for daytime use.

[–] wheels 1 points 1 year ago

Maybe HASS is better than this but it’s not simple to schedule Hue to have the right colours at the right time. At least, not at my latitude. I’ve got separate summer and winter schedules and that helps a lot, but especially in the summer it’s pointless using the built in sunset/sunrise events.