You can get a decent idea of the color shifts from an LED light’s spectrum if the manufacturer publishes TM-30 data for it. This attempts to compare color rende

You can get a decent idea of the color shifts from an LED light’s spectrum if the manufacturer publishes TM-30 data for it. This attempts to compare color rendering similarity vs a reference illuminant, based on 99 spectral reflectance distributions representing a variety of objects that might be illuminated. The standard has been around since 2015, but unfortunately many LED light manufacturers still don’t provide this. The spectrum data gets boiled down (or not) in a couple of ways: 1) Rf, or “fidelity index” where a score closer to 100 means it renders colors more similarly to how they look under a reference illuminant (which standard illuminant is used for comparison depends on color temperature). But as you summarize more information down to fewer values, you of course get less detail - many different spectrums could provide an Rf of 95, with different visual effect. Rf only gives you an idea of whether the visual difference between this light source and the reference illuminant will be large or small. It’s a similar concept to “CRI” scores if you’re familiar with that, but based on a much better set of samples, and not as easily gamed for a high score by carefully designing an LED’s spectrum to correctly render CRI’s more limited set of color samples. 2) Color vector graphic, shown on page 28 of the PDF linked below, shows a smushed circle which broadly illustrates how different hues are shifted. For example, reds might be undersaturated and shifted toward orange. This is still summarizing, not all red objects will have the same shift, depending on their precise spectral reflectance distribution and the source’s spectral power distribution. But it gives a better idea of how the light will look than the Rf alone. 3) Color sample vectors shown on page 24 of the same PDF, which shows each of the individual 99 spectral reflectance samples used for TM-30 and how it will shift compared to when viewed under the standard illuminant. The color vector diagram in point 2 is a summary of these, but if you want more detail you could see them individually. I’m not sure anyone actually publishes this since these particular 99 samples aren’t likely applicable to whatever you’re doing. And ultimately it’s still not the full story, because this is all based on 99 specific color samples attempting to be a representative spread of materials you might encounter in the real world. But 99 samples certainly can’t represent all materials. To get real answers you’d need to go down the same rabbit hole that the article did and measure the spectral reflectance of every object you’re lighting. https://www.energy.gov/sites/default/files/2022-04/ssl-royer-leukos-tm-30-tutorial-2022.pdf https://www.energy.gov/sites/default/files/2022-04/ssl-royer...