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CRI (Color Rendering Index) measures how accurately a light source renders colors compared to a reference source. A CRI of 100 means colors look exactly as they would under the reference (sunlight or incandescent, depending on CCT). Lower CRI means some colors look muted, shifted, or unnatural. For applications where color appearance matters — retail, photography, art, food display — CRI is as important as color temperature.
How CRI Works
CRI is an average score across 8 standard test color samples (R1–R8), rated 0–100. A separate extended set (R9–R15) tests additional colors including saturated red (R9), which is notoriously difficult for LEDs.
| CRI Range | Quality | Typical Source |
|---|---|---|
| 95–100 | Excellent | Sunlight, incandescent, top-tier LEDs |
| 90–95 | Very good | High-CRI LED modules |
| 80–90 | Good | Standard white LEDs (most of our catalog) |
| 70–80 | Acceptable | Budget LEDs, some fluorescents |
| Below 70 | Poor | Low-pressure sodium, some industrial lighting |
Most of our white LED modules fall in the 80–90 CRI range, which is good for general illumination. For color-critical work, CRI alone is not the full story — color consistency between modules matters just as much.
CRI vs Color Consistency
Two LED modules can both have CRI 80 and still produce visibly different white light if their color points are not matched. This is where LED binning comes in.
- Standard Rebel LEDs — CRI 80+, standard binning. Good for general lighting where slight module-to-module color variation is acceptable.
- LUXEON Rebel PLUS — CRI 80+, ANSI-binned. The color point is guaranteed to fall within a defined ANSI Bin, so two modules at the same CCT look identical. This is what matters most for multi-module installations.
For photography, retail, and any application with multiple LED sources illuminating the same area, color consistency (ANSI binning) is more important than peak CRI. A set of 10 modules at CRI 80 that all match each other will look better than 10 modules at CRI 90 with random color variation.
When CRI Matters
| Application | CRI Needed | Why |
|---|---|---|
| Photography / video | 80+ with ANSI binning | Color consistency between lights matters more than peak CRI |
| Retail / food display | 90+ preferred, 80+ minimum | Merchandise and food look more appealing under high CRI |
| Art galleries / museums | 90+ preferred | Accurate color rendering of artwork |
| Office / warehouse | 80+ | Standard quality, no color-critical tasks |
| Industrial / machine vision | Depends on camera | Cameras care about spectrum, not CRI. Mono cameras don’t care at all. |
| Outdoor / security | 70+ acceptable | Color quality is secondary to visibility |
Limitations of CRI
CRI has known weaknesses. It uses only 8 test colors and averages them, which means a light can score CRI 80 while rendering one specific color poorly. The R9 (saturated red) value is particularly important for skin tones and food — ask for R9 data if it matters to your application.
Newer metrics like TM-30 (IES) provide more complete color quality data, but CRI remains the industry standard and the metric published on most LED datasheets.
