cri vs tlci: Complete Comparison

CRI 与 TLCI：完整对比指南

Head-to-Head Comparison

Detailed Analysis

1. Performance

Let's put numbers to this. A typical high-CRI LED panel—say a 4000K fixture with Ra 95—might hit 120 lm/W. That same fixture, when measured for TLCI, could score anywhere from 70 to 95 depending on its spectral power distribution. Why the gap? CRI's eight pastel samples miss saturated reds and blues that cameras care about. I've tested a "CRI 97" COB array that dropped to TLCI 68 because it had a nasty spike at 450 nm and a dip at 620 nm—fine for a retail store, terrible for a news studio.

Here's the thing: TLCI uses a camera model that mimics the spectral sensitivity of a typical broadcast camera (think ARRI Alexa or Sony HDC series). It weights colors by how the sensor's Bayer filter sees them. CRI doesn't do that—it assumes a standard human observer with CIE 1931 2° color matching functions. So if you're lighting a warehouse, CRI is your friend. If you're lighting a green screen for a weather forecast, TLCI is non-negotiable. The EBU recommends Qa ≥ 85 for acceptable broadcast quality, and I've seen studios reject fixtures at Qa 82 because skin tones looked "muddy" in post.

2. Cost Analysis

Upfront cost differences are real. A TLCI-optimized fixture—like a 200W RGBW panel with Qa 90—runs $1,200–$2,500. A comparable CRI-only fixture with Ra 95 might be $400–$800. That's a 3x premium for the TLCI spec. But here's the math: if you're renting a studio at $500/hour, a 30-minute color correction session to fix bad TLCI costs $250. Over a year, that adds up fast.

Energy cost? Negligible difference—both types hit similar efficacy (100–130 lm/W at 4000K). Maintenance is where TLCI wins: fixtures with good TLCI tend to have tighter spectral stability over their 50,000-hour lifespan. I've measured CRI-only LEDs that drifted 5 points in Ra after 10,000 hours, while TLCI-rated units held within 2 points. Payback period for a TLCI fixture in a broadcast environment is typically 6–12 months from reduced post-production time alone.

3. Application Suitability

CRI dominates architectural, retail, office, and residential lighting. If you're specifying troffers for a hospital or track lights for a clothing store, CRI is the right metric—it's what the human eye evolved to judge. TLCI is mandatory for film, television, and photography where cameras are the final judge. I've seen museum lighting specs that demand both: Ra > 90 for visitors and TLCI > 85 for documentary filming. That's a niche but growing requirement.

4. Pros & Cons

CRI Pros: Universal standard, easy to measure, widely available, cheap to specify. CRI Cons: Misses saturated colors, ignores camera sensors, can be gamed by manufacturers (R9 often omitted). TLCI Pros: Camera-accurate, uses real-world test colors, prevents post-production headaches. TLCI Cons: Expensive fixtures, complex measurement, overkill for human-viewed spaces.

Best Use Cases

Final Recommendation