CRI-8 is a colour-rendering improvement (CRI) filter that warms and smooths spiky LED/HMI spectra by trimming deep blue and broad yellow-green while preserving blue-cyan and long-red. Transmission stays high in near-blue (~86–90% from ~390–430 nm), falls to a deep notch of ~14–16% around ~450–460 nm, rebounds to ~90–93% across ~495–505 nm, then dips broadly through ~535–600 nm to ~20–25% near ~560–585 nm. Long-red shows two clean lobes—~92–95% around ~660–690 nm and again ~740–750 nm—with a shallow valley of ~80–85% near ~710–720 nm, easing to ~66–70% by ~780 nm.
Key advantages
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Raise CRI/TLCI and R9 — moderates the ~450–460 nm spike and the ~535–600 nm band while keeping strong long-red for natural skin, wood, food, and fabrics.
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Cyan window preserved — ~90–93% T through ~495–505 nm maintains blue-cyan detail for accurate whites and skies.
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Dual-lobe long-red — high throughput in ~660–690 nm and ~740–750 nm with a controlled dip near ~710–720 nm for balanced warmth without oversaturation.
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Predictable shaping — smooth slopes and broad features avoid banding and keep colour adjustments consistent.
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Built for production — durable dielectric stack for sets, stages, and architectural fixtures; optional rear-surface AR and slight wedge to suppress ghosts.
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Custom formats — Borofloat®, Eagle XG, or D263 T (0.21–3.8 mm) for high-temp duty to ~450 °C; soda-lime for ≤150 °C. Sizes 5–450 mm.
Typical applications
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Cinema/TV lighting — lift TLCI/CRI and skin-tone accuracy with less in-camera correction.
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Photography & events — warmer, more flattering faces and textiles under LED or HMI.
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Retail, museum & hospitality — reduce green cast and reveal natural reds in merchandise and art.
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Architectural & display — refine off-the-shelf luminaires for premium colour.
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Machine vision — balance channels where red features matter and blue/green glare is problematic.
Need test chips tomorrow or thousands next quarter? CRI-8 filters are coated and cut-to-size (including dicing) to your exact spec—fast.
