CTO-040 Warming color-correction filter

Warming color-correction filter (CTO-040)

CTO-040 is a warming color-correction filter. It reduces blue-to-green light relative to longer visible wavelengths. This can give a suitable broadband light source a warmer balance. Average transmission in the sample is 27.1% over 400-500 nm, 49% over 500-600 nm, 92.5% 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 27.1% average transmission; the range is 2.6-80.5% in the measured curve.
• 500-600 nm: Approximately 49% average transmission; the range is 3.6-95.5% in the measured curve.
• 600-700 nm: Approximately 92.5% average transmission; the range is 90.3-95.8% in the measured curve.
• Measured edge at 50% transmission: Approximately 552.0 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

• Stage and architectural lighting: Try it when you need a warmer balance from a broadband white light source. Check the color and brightness with your actual light source before choosing a filter.
• Film and photographic lighting: Consider it for warming a daylight or cool-white fixture toward another light in the scene. Measure the color match with the actual fixtures and camera.
• Fixture development: Use the measured color-shaping profile to compare available coatings. Confirm the required color temperature, tint, throughput and operating conditions on the assembled fixture.

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.