One answer is to stack 3 LEDs on the die, each tuned to the center wavelength of human photo-receptors. Existing RGB LEDs emulating "white" suffer from shadowing effects where shadows have a color based on the parallax between the red, green, and blue elements in the light bulb. This is no longer an issue if you co-locate the emitters.
What's interesting to me is that LEDs were apparently a Russo-Japanese invention yet the industry is now completely dominated by China. LED lightshows of an evening are a very late naughties China thing, every town has one these days, hell almost every building has one. Makes for interesting skylines, but no doubt terrible for ambient light pollution, insect life, etc.
China dominates most electronic industries, few of which were invented there.
Interesting that you say LEDs are a Russo-Japanese invention because all colors of LED were first commercialized in the US. The high-brightness blue LED was discovered in the US but commercialized by a Japanese company.
I installed Lifx bulbs in the main living area of my house. They are controlled by wifi through an ios app that can change the color and intensity of each bulb. I schedule sleep mode at 10.30pm and normal intensity at sunrise.
If I want to override the schedule at night I just turn the wall switch off/on and the bulbs wake up.
I like these wifi LED lights. They are the most reliable aspect of my life.
I think that most people vastly underestimate how important lighting is to a living space. I frankly think that a $500K house with great lighting feels like a much bigger, higher-end $1 million house.
Get lots of high-CRI lighting, at daylight and warm white color temperatures, have them automatically shift from blue to red on a daily basis. If you can't do a permanent installation, get those 5-arm floor lamps.
While it's usually okay to assume that a light source with a high CRI offers better looking light than one with a lower CRI, that assumption can be incorrect.
CRI is a measurement of color fidelity, i.e. how closely a light source renders a specific color as compared to a reference light source, which is either daylight or an incandescent lamp, depending on the correlated color temperature of the light source we're measuring.
One problem is that CRI is measured by evaluating color fidelity over only 8 color samples, mostly pastels. Some argue that 8 sample don't have enough coverage, esp. when it comes to reds, which are important for rendering skin tones. The missing red color samples is the reason why folks started using R9 as a metric in addition to CRI.
Another problem is that high color fidelity in a light source is not always positively correlated with user preference. For example, there have been light sources developed to render colors in a more saturated way than daylight or incandescent light, which gives them a low CRI but users preferred them to higher CRI lights.
The solution has already been proposed: TM-30, which is a new standard that measures both color fidelity, Cf, and color gamut, Cg (essentially color saturation), and also uses 99 color samples instead of CRI's 8. You can read more about TM-30 in the paper here: https://www.energy.gov/sites/prod/files/2019/07/f64/royer-et...