CRI-30 Color Rendering Improvement Filter

CRI-30 is a colour-rendering improvement (CRI) filter that warms and smooths spiky LED/HMI spectra by suppressing deep blue and yellow-green while preserving cyan and long-red. Transmission sits high in the near-UV/blue (~85–90% around 390–410 nm), drops into a deep blue notch near ~445–455 nm (~12–18% T), surges to a blue-cyan window of ~90–93% around ~490–510 nm, then falls across ~520–590 nm to a minimum of ~18–25% T near ~555–570 nm. It recovers hard through the red, delivering ~90–96% T across ~660–730 nm before tapering to ~65–70% by ~780 nm.

Key advantages

• Raise CRI/TLCI and R9 — trims the ~450 nm spike and the ~520–590 nm region while keeping strong long-red for natural skin, food, wood and fabrics.

• Dual-pass profile — high throughput in blue-cyan (~490–510 nm) and long-red (~660–730 nm) with controlled attenuation at ~450 nm and ~560 nm.

• Colour-temperature tuning — shifts overly cool sources toward neutral/warm without magenta/green casts.

• Predictable shaping — smooth slopes and broad features avoid banding and protect colour balance.

• 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 with less 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 — balance channels where red features matter and blue/green glare is problematic.

Need test chips tomorrow or thousands next quarter? CRI-30 filters are coated and cut-to-size (including dicing) to your exact spec—fast.