cri vs tm-30-18: Complete Comparison

CRI与TM-30-18：完整对比

Head-to-Head Comparison

Detailed Analysis

1. Performance

Let's put numbers to this. A typical LED with CRI 80 might have R9 (deep red) as low as 0–10. That same fixture could score Rf 75 and Rg 95 under TM-30-18. The CRI number looks acceptable, but the TM-30 report reveals the reds are basically dead. I've seen this on job sites—a "high CRI" 90+ LED that makes a brick wall look like gray cardboard. TM-30-18 catches that because its 99 color samples include saturated reds, blues, and greens that CRI's eight pastels ignore.

The fidelity metric Rf correlates reasonably well with CRI—within about 5 points for most white LEDs—but the gamut metric Rg is where TM-30-18 earns its keep. Rg tells you whether colors are oversaturated (Rg > 100) or desaturated (Rg < 100). For retail, you might want Rg around 105–110 to make merchandise pop. For a hospital, you'd want Rg near 100 to avoid distorting skin tones. CRI gives you none of that. Bottom line: if you're buying for a color-critical application, CRI alone is a gamble.

2. Cost Analysis

Here's the practical reality: specifying TM-30-18 doesn't cost you more per fixture—it costs you more in testing. A standard CRI test runs about $50–$100 per report. A full TM-30-18 test with spectral data runs $150–$300. For a large project with 50 fixture types, that's $7,500–$15,000 in testing versus $2,500–$5,000. The fixtures themselves? Identical. You're paying for the data, not the hardware.

But here's where it gets interesting. If you're buying 10,000 fixtures for a retail chain, the TM-30 spec might save you from a $200,000 rework when the "CRI 90" LEDs make your brand colors look wrong. I've seen that happen. The testing cost is a rounding error compared to the liability. For commodity office lighting where color quality doesn't matter? Stick with CRI 80 and save the testing budget. For anything where color matters, TM-30-18 pays for itself on the first project.

3. Application Suitability

CRI is fine for general illumination—warehouses, parking garages, basic office lighting where you just need to see. TM-30-18 is essential for retail, museums, art galleries, healthcare (skin tone assessment), and any application where color appearance drives business outcomes. The catch is that many specifiers still don't know how to read TM-30 reports. You'll need to educate your team or rely on a lighting designer who does.

What does this mean in practice? If your client asks for "good color rendering," CRI 80 is the floor. But if they say "we need accurate color," you need TM-30-18 with Rf ≥ 90 and Rg between 95 and 105. Don't let anyone sell you "CRI 90+" as equivalent—it's not, and I've measured the difference on a spectrophotometer.

4. Pros & Cons

Best Use Cases

Final Recommendation