Spectrum Designer

Explore how different spectral components combine and how the resulting spectrum affects chromaticity and color-rendering metrics. Mix LED die, phosphor and packaged-LED spectral libraries and watch the spectral power distribution, CIE chromaticity, CCT, Duv and CIE 13.3-1995 color rendering indices update live.

The designer combines component spectra using relative spectral weighting. This is useful for exploring spectral targets and multi-channel mixtures, but it is not a complete physical simulation of an LED package: when die and phosphor components are combined here, the result is a spectral design approximation. Actual phosphor-converted LED performance depends on material, optical, package, and thermal interactions.

For CRI/R9 background first, see our High CRI LED Lighting Guide or try the CRI Comparison Tool .

The simulated color swatch represents the calculated chromaticity within the limitations of your display. A monitor cannot reproduce the full spectral properties of a light source — a calibrated display improves consistency, but it does not reproduce the actual SPD.

Each slider sets the relative spectral weight of a component — its relative contribution to the calculated spectrum, which is normalized to its peak. Values are not phosphor concentrations, drive currents, or power percentages.

370nm

9nm

390nm

11nm

405nm

15nm

415nm

15nm

425nm

16nm

435nm

21nm

445nm

19nm

450nm

16nm

455nm

20nm

460nm

18nm

470nm

20nm

520nm

33nm

530nm

36nm

540nm

37nm

620nm

17nm

630nm

16nm

640nm

17nm

650nm

17nm

660nm

17nm

730nm

20nm

850nm

32nm

940nm

37nm

Spectral Power Distribution

CIE 1931 Chromaticity

Optical Parameters

CIE 1931 — x0.0000

CIE 1931 — y0.0000

CIE 1960 — u0.0000

CIE 1960 — v0.0000

CIE 1976 — u'0.0000

CIE 1976 — v'0.0000

CCT (K)Not applicable

DuvNot applicable

Simulated color

Melanopic DER0.00

mEDI at 500 lx0 lx

Color Rendering Index (CIE 13.3-1995)

—

R10

—

R11

—

R12

—

R13

—

R14

—

General CRI (Ra) — mean of R1–R8

—

General CRI (Ra) is calculated from the first eight CIE test color samples per CIE 13.3-1995; R9–R14 are separate special color rendering indices. Professional color-rendering evaluation often also considers metrics such as IES TM-30 (Rf, Rg), which must be calculated independently from the SPD and are not implemented here.

CRI — Ri

Working toward a target spectrum?

Use the designer to explore a target spectral direction, then share your target CCT, CRI/R9 and application — our engineering team can evaluate how that target may be translated into a manufacturable LED architecture.