Let the material palette guide selection. Stone with cool veining appreciates a gentle 3000K, while rich walnut sings at 2700K, especially when the output subtly recedes at night. Consistency matters more than dogma: align all downlights, linear runs, and accents within a close range to preserve coherence. In social zones, consider warm-dim retrofits that drift to amber as they dim, mirroring candlelight cues that humans intuitively read as intimate, calm, and deeply welcoming.
Beyond CRI, evaluate TM-30 reports for a truthful picture. Seek Rf scores above 90 and balanced Rg that avoids oversaturation while maintaining lively reds. Textiles, leathers, and artworks retain depth when spectral gaps are minimized. Specify consistent LED families across fixtures to prevent mismatched color that cheapens the impression. Bring a fabric swatch and art print to the showroom; what looks acceptable on paper may either sing or suffer once illuminated by the actual spectrum you select.
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