CRI-20 is a colour-rendering improvement (CRI) filter that warms and smooths spiky LED/HMI spectra by trimming deep blue and yellow-green while preserving a cyan window and strong long-red. Transmission shows a twin blue notch—~12–18% near ~400–405 nm and again around ~445–455 nm—with a narrow cyan rise to ~88–90% at ~495–505 nm. It then dips through green/yellow to ~22–25% near ~550–565 nm before climbing to a long-red plateau of ~93–95% from ~630–720 nm and easing down toward ~65–70% by ~780 nm.
Key advantages
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Raise CRI/TLCI and R9 — moderates the ~400–455 nm spikes and the ~520–600 nm band while keeping strong long-red for natural skin, wood, food, and fabrics.
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Twin-notch, dual-pass profile — deep attenuation at ~400–405 nm and ~445–455 nm with high throughput in cyan (~495–505 nm) and long-red (~630–720 nm).
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Colour-temperature tuning — shifts overly cool sources toward neutral/warm without magenta/green casts.
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Predictable shaping — smooth slopes and broad features avoid banding and preserve colour balance.
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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-20 filters are coated and cut-to-size (including dicing) to your exact spec—fast.
