CRI-29 is a colour-rendering improvement (CRI) filter that warms and smooths spiky LED/HMI spectra by suppressing deep blue and broad yellow-green while preserving a cyan window and strong long-red. Transmission sits high in the near-UV/blue (~85–88% at ~390–410 nm), drops into a deep blue notch near ~445–455 nm (~5–8% T), rises sharply to a narrow cyan peak of ~80–85% around ~490–500 nm, then falls into a wide trough across ~520–650 nm with a minimum of ~6–10% near ~545–570 nm. It climbs steeply through the red to ~93–96% by ~700–730 nm and holds ~92–95% toward ~780 nm.
Key advantages
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Raise CRI/TLCI and R9 — moderates the ~450 nm spike and the ~520–650 nm band while keeping strong long-red for natural skin, wood, food, and fabrics.
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Dual-notch, dual-pass profile — deep attenuation at ~450 nm and ~540–570 nm with high throughput in cyan (~490–500 nm) and long-red (>~700 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 protect 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-29 filters are coated and cut-to-size (including dicing) to your exact spec—fast.
