CRI-32 Color Rendering Improvement Filter

CRI-32 is a colour-rendering improvement (CRI) filter that warms and smooths spiky LED/HMI spectra by trimming blue and yellow-green while preserving strong reds. Transmission is low in the deep blue (~5–12% from 380–420 nm), rises to ~40–45% near 455–465 nm, dips through blue-green to ~30–35% around 500–520 nm, then makes a steep red lift between ~590–630 nm to ~75–80%, continuing up to ~88–92% by ~760–780 nm.

Key advantages

• Raise CRI/TLCI and R9 — moderates blue (~380–500 nm) and yellow-green (~500–560 nm) while emphasising long-red for truer skin, food, wood, and fabrics.

• Warm CCT, smoother SPD — shifts overly cool sources toward neutral/warm and evens out spectral gaps.

• High red throughput — ≈80–92% T above ~620 nm preserves deep-red fidelity and saturation.

• Broad, predictable shaping — gentle blue/green control avoids harsh magenta/green casts or banding.

• Built for production — durable dielectric stack for sets, stages, and architectural fixtures; optional rear-surface AR and slight wedge to suppress ghosts.

• 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

• Cinema/TV lighting — lift TLCI/CRI and skin-tone accuracy without heavy in-camera correction.

• Photography & events — warmer, more flattering faces and textiles under LED or HMI.

• Retail, museum & hospitality — reduce green cast and reveal natural reds in merchandise and art.

• Architectural & display — refine off-the-shelf luminaires for premium colour.

• Machine vision — tame blue/green glare and balance channels when red features matter.

Need test chips tomorrow or thousands next quarter? CRI-32 filters are coated and cut-to-size (including dicing) to your exact spec—fast.