/**
 * Kelvin → RGB conversion utilities.
 *
 * Uses Tanner Helland's approximation, valid from ~1000 K to ~40 000 K.
 */
export interface KelvinRGB {
    r: number;
    g: number;
    b: number;
    hex: string;
}
/**
 * Linear RGB colour corresponding to a colour temperature in Kelvin.
 */
export declare function kelvinToRGB(kelvin: number): KelvinRGB;
/** Normalised `{ r, g, b }` in `[0, 1]` for Three.js. */
export declare function kelvinToThreeColor(kelvin: number): {
    r: number;
    g: number;
    b: number;
};
/** Qualitative description of a spectral type for a given temperature. */
export declare function kelvinLabel(k: number): string;
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