Sounds like something easy to do with a smart bulb and the right application. I think most if not all smart bulbs including white-only have two CCT sets. A defective Philips Hue bulb I opened up was like this.I'm thinking to have a timing circuit in its microcontroller, so its color temp could change throughout the day; before & after sunset would be defaulted to 'warm'. The simplest way to set it would be its first turn-on after installation to be 6pm perhaps.
Those options to be able to change color temperature and color come with some subtle disadvantages, and even some limitations, which most people do not realise, and probably do not care about.These smart bulbs blow my mind. Not only changing the color temp but all the multi-color options through the phone app.
I presume by that that you mean it is much more preferable to have all the bulbs be 3000K, 3500K, or 4000K, rather than using a combination of 2700K and 5000K bulbs together because you find the light color of one too orange and the light color of the other too bluish.Color temp matching is important in multiple bulb fixtures.
Check out this thread on my opening up low-cost LED bulbs (those which have plastic tops, so far)"I presume by that that you mean it is much more preferable to have all the bulbs be 3000K, 3500K, or 4000K, rather than using a combination of 2700K and 5000K bulbs together because you find the light color of one too orange and the light color of the other too bluish.
Another problem, which many may not realise, is that if you simply combine 2700K and 5000K, the resulting mix of light is going to end up having a slight magenta tint color cast.
The thing is, as you start increasing color temperature from 2700K, the ratio of green light (in the combined white spectrum) at first starts increasing at a more rapid rate than blue light, but eventually rate of increase in blue light starts catching up by the time you get to 5000K.
But apparently this doesn't seem to be too much of a problem in these color adjustable bulbs for some reason.
I have a G-E bulb with adjustable color temp - only three levels though, and it requires an app to change the setting. It's kind of annoying.Check out this thread on my opening up low-cost LED bulbs (those which have plastic tops, so far)"
I thought to start a thread about what's inside ordinary low-cost LED ac bulbs, as I have taking the plastic tops off a number of them. This is usually not a complete teardown, and does not include glass bulbs, such as filament bulbs. Majority of these use high-voltage linear regulation...www.candlepowerforums.com
I have not opened the EcoSmart A19 bulb yet. However, Sylvania Smart+ RGBW Wi-Fi bulb (which are available OTC here for 2/$5) contains two sets of white LEDs with different CCT. Similar with Commercial Electric LED ceiling fixture with CCT change feature (switch).
I was wondering about the result of mixing two CCTs instead of a single CCT at desired value; good info in this thread.