CRI-4 Spectral-shaping filter for color correction

Spectral-shaping filter for color correction (CRI-4)

CRI-4 is a spectral-shaping filter for color correction. It reshapes the source spectrum by attenuating selected visible wavelengths rather than adding missing colors. Average transmission in the sample is 73.4% over 400-500 nm, 56% over 500-600 nm, 90.1% over 600-700 nm. The resulting light output also depends on the lamp spectrum.

Optical performance

• Measured wavelength range: 380-800 nm. Performance outside this measured interval is not established by this curve.
• 400-500 nm: Approximately 73.4% average transmission; the range is 40.7-94.1% in the measured curve.
• 500-600 nm: Approximately 56% average transmission; the range is 33.7-90% in the measured curve.
• 600-700 nm: Approximately 90.1% average transmission; the range is 60.2-95.9% in the measured curve.
• Measured edge at 70% transmission: Approximately 529.4 nm. Interpolated absolute-transmission crossing, checked against the factory summary.
• Customization: We can customize stock and sample-book designs. Tell us the wavelength response, size and operating conditions you need.

These values come from the measured samples and help you choose a starting design. We will agree the final specification for your order. Custom versions have their own specifications and measured curves.

Applications to consider

• LED and discharge-lamp development: Check whether reducing selected peaks improves the balance of your light source. Compare color rendering and luminous output before and after filtering.
• Studio and display lighting: Consider the filter when a measured color imbalance affects the desired appearance of skin tones or objects. Test with the actual source and viewing or camera conditions.
• Color-correction trials: Compare this profile with other correction filters using the same source. A color-rendering score belongs to the resulting light, so it must be measured or calculated for that combination.

Choosing this filter

• Evaluate the filter together with the intended light source. Color temperature, tint, color rendering and luminous output depend on that combination.
• Tell us the size, shape and working angle you need, along with the temperature conditions inside the fixture.

Custom options

Start with this stock or sample-book design, then tell us what you need to change. We can discuss the wavelength bands, transmission, blocking, angle, glass material, size and operating conditions with you, and agree a specification for your custom filter.