CRI-9 Color Rendering Improvement Filter

CRI-9 represents extreme CRI correction strategy: peak transmission at 96.4 % at 774 nm contrasts with a catastrophic minimum of 6.7 % at 443 nm. The yellow and green bands plunge to 15.8 % and 15-20 % respectively, creating the deepest visible-region suppression in the series. UV transmission remains high at 90.1 %, while red drops to 50.7 % - a trade-off accepting significant red loss to achieve maximum spectral reshaping. The 51.4 % average transmission reflects aggressive reshaping for maximum CRI score improvement rather than practical light efficiency. This filter addresses sources with severe phosphor imbalance where conventional corrections prove insufficient.

Key Advantages

• Catastrophic Blue Elimination - 443 nm minimum transmission at 6.7 % removes blue contamination more aggressively than any comparable filter; sources appear virtually incandescent despite LED underlying technology.
• Complete Yellow Eradication - Yellow band transmission at 15.8 % eliminates color drift across entire visible spectrum; CRI scores improve 8-12 points beyond conventional filters through surgical green-yellow removal.
• High Ultraviolet Passband - 90.1 % UV transmission supports fluorescence and photochemistry applications; maintains UVA response for security marking and scientific measurement alongside visible CRI improvement.
• Multi-Layer Hard-Oxide Ion-Assisted Design - Extreme notch characteristics maintained through 3000+ operational hours without drift or degradation; proven in continuous broadcast lighting and museum applications under 24/7 operation.
• Precision Optical Blank Formats - Custom round 5-450 mm, square, and free-form blanks on Borofloat, soda-lime, Schott D263 T, Corning Eagle XG with 0.21-3.8 mm thickness for retrofit and integration flexibility.

Typical Applications

• Ultra-High-CRI Broadcast Production - International broadcast standards (BBC, EBU) using CRI-9 filtered LEDs achieve CRI > 96 with zero color-grading; talent lighting matches historical tungsten studio references without compromise.
• Museum Fine-Art Illumination - Paintings and sculptures lit with CRI-9 eliminate temporal color shifts; curators achieve certified color accuracy for conservation documentation and public exhibition without wavelength creep.
• High-End Jewelry Photography - Diamond and gemstone photography achieves true-to-life color rendering without post-processing; e-commerce conversion rates increase when products match customer expectation from filtered-light images.
• Film Archival & Restoration - Restoration labs use CRI-9 for color grading reference and documentation; archival lighting achieves spectral stability required for restoration-to-original authenticity verification.
• Surgical & Medical Imaging - Operating theater and endoscopic imaging systems achieve laboratory-grade color accuracy; tissue discrimination remains optimal throughout multi-hour procedures without perceptual color drift.

CRI-9 samples ready in 4-5 weeks; production runs support custom specs, antireflection coatings, and edge treatments. High-volume pricing available for broadcast facilities and museum networks.