CRI-7 Color Rendering Improvement Filter

CRI-7 employs radical spectral sculpting to deliver aggressive CRI improvement. Peak transmission of 95.7 % at 724 nm contrasts sharply with a catastrophic minimum of 7.1 % at 436 nm - among the deepest blue suppression in the filter range. The 430-560 nm band averages 7-31 % transmission, effectively eliminating blue and green contamination that degrades warm-white CRI in phosphor-converted sources. High UV pass (78.6 %), and dominant red (78.9 %) create a source profile resembling pre-industrial incandescent warmth. The 60.3 % average transmission reflects the flux trade-off inherent to maximum spectral reshaping.

Key Advantages

• Ultra-Deep Blue Notch - 436 nm transmission bottleneck at 7.1 % virtually eliminates the cool violet spike that causes visual color shifts; dramatically warmer appearance with single-digit Kelvin uncertainty.
• Entire Green Band Suppression - 430-560 nm region held below 31 % transmission creates an effective color-correction comb that removes multiple LED phosphor peaks simultaneously, not just the dominant line.
• Extended Infrared Pass - 94.9 % NIR transmission preserves heat-related spectral content that psychophysically enhances perceived warmth; important for applications where thermal ambiance matters alongside visual color.
• Precision Hard-Oxide Coating System - Ion-assisted multilayer design maintains steep notch profile under 1000+ hour continuous operation at full power; no wavelength creep or notch broadening even at 100+ °C substrate temperature.
• Optical Geometry Customization - Round, square, and bespoke free-form blanks from 5 mm to 450 mm diameter available on Borofloat, soda-lime, Schott D263 T, Corning Eagle XG; thickness 0.21-3.8 mm for any optical path requirement.

Typical Applications

• Theatrical Warm-Tone Washes - Stage and theater fixtures achieve authentic candlelight and tungsten-like CRI; audience perception of source naturalness increases dramatically compared to unfiltered LEDs at equivalent wattage.
• Architectural Warm-Night Facade Lighting - Building exteriors lit with CRI-7 filtered sources appear as if illuminated by incandescent fixtures; eliminates the cold LED look that makes modern architecture appear corporate or clinical.
• Hospitality Ambient Lighting - Restaurants and lounges achieve the 'fireplace glow' aesthetic with 95+ CRI; guests relax under natural warmth that encourages longer stay times and higher spending per visit.
• Film & Television Production - Key lighting for period pieces and drama benefits from incandescent-equivalent spectral response; color grading in post-production becomes minimal, reducing DIT hours and post-production costs.
• Luxury Retail Product Display - High-value goods (watches, handbags, cosmetics) photographed under CRI-7 lighting require zero color correction for e-commerce; customers perceive authenticity and are more likely to purchase.

CRI-7 samples turnaround in 3-4 weeks; production runs from 25 units onward with custom thickness, substrate, and edge finishes. Volume pricing available for theater circuits and architectural integrators.