Do any LEDs allow for changing tint with brightness? Like for an extreme example, deep red at min brightness, yellow at med brightness, blue-white at max brightness.
They all do this a little. Kind of in the way you described too. Some more than others. But idk if there’s an extreme example like that out there.
Flashlights with 2 channels and two different color LEDs on each arent hard to come by though. Sort of accomplishes the same thing.
Nearly all LED’s have a bit of tint/CCT change with brightness but not to that extent. You can set up a dual channel Anduril light so it goes from warm to cool based on brightness (or the opposite) though.
There are COBs that do it. I guess it’s technically implemented as tint mixing.
Philips has had a mains-powered bulb that does this for a while. I’m confident that as @Agro has mentioned it’s implemented as dynamic tint mixing.
Any Anduril light with tint ramping (like the BLF LT1 or Hank’s 2-channel tint-ramp lights), if configured with warm white and cool white LEDs inside, can use an “auto tint” mode which ties the CCT to brightness. So it’s warm white while dim, and cool white while bright, with a smooth adjustment between.
Or the new LT1S Pro has a red channel, and I added a 3-channel “auto tint” mode for it just yesterday. Red when dim, warm white at medium levels, cool white at high levels. And I set that as the default color mode so it should work straight out of the box. But I haven’t sent the code to anyone yet, so I don’t think it will ship on the initial batch of lights which just went up for sale yesterday.
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I have a number of these WarmGlow PAR20 downlights installed to replace halogen 50W ones. The CCT change while dimming looks great and very natural (halogen-like). Without the CCT “dimming” they just looked wrong.
Dimmers and low CCTs aren’t my thing thus I’ve no experience with the product, however I certainly had experience with the phenomenon as a youngster in the 80s and 90s when the hot wire was the only option in residential lighting thus can appreciate how dimming without CCT shift would look a tad off.