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Products / Color Temperature Blue Filters / CTB-200
CTB-200 spectral response — original published curveOpen full-size image ↗
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Color Temperature Blue Filters

CTB-200Color Temperature Blue (CTB)

CTB-200 is a cooling color-correction filter. It transmits more of the blue region than the red region. This can give a warm light source a cooler balance. Average transmission in the sample is 94.9% over 400-500 nm, 30.2% over 500-600 nm, 17.4% over 600-700 nm. The resulting light output also depends on the lamp spectrum.

  • Product family: Color Temperature Blue (CTB)
  • Measured wavelength range: 380–780 nm
  • Published response: Transmittance

Measured interval is not the passband. Values shown are sample measurements. Final specifications are agreed for your order.

MEASURED OPTICAL RESPONSE

Read the light.

Original published sample data.

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Nearest measured point shown; no interpolation or extrapolation. Original sample values are preserved, including values outside 0–100%. Samples are selection references, not production acceptance limits.

OPTICAL PERFORMANCE · CTB-200

Read the numbers.
Understand the response.

Measured wavelength range

380-780 nm. Performance outside this measured interval is not established by this curve.

400-500 nm

Approximately 94.9% average transmission; the range is 87.4-95.7% in the measured curve.

500-600 nm

Approximately 30.2% average transmission; the range is 11.5-87.4% in the measured curve.

600-700 nm

Approximately 17.4% average transmission; the range is 12-22.6% in the measured curve.

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.

OPERATING CONDITIONS

Match the complete optical system.

Match the full source band.

Compare the source emission spectrum with the filter curve. Include the source bandwidth, rather than relying on the nominal wavelength alone.

Check unwanted response.

Compare the complete measured response with your detector sensitivity. Confirm any additional blocking needed for your system.

Define the incidence conditions.

Specify the working angle and whether the beam is collimated or converging. Confirm the required response under those conditions.

Confirm the physical fit.

Provide the available mounting space, required shape, dimensions and thickness. Physical specifications will be confirmed for your assembly.

APPLICATIONS

Where this profile can help.

Architectural & Museum Lighting

Color, glare and spectral control for built environments and exhibits.

Stage, Studio & Projection

Color, patterns and beam control for performance and projection.

Imaging & Photography

Manage exposure, unwanted wavelengths and reflection.

Application examples are starting points for evaluation; suitability depends on the complete optical system.

CUSTOM & ENQUIRY

Tell us what
your design needs.

Start with CTB-200 and discuss the spectral response, physical format and operating conditions.

Include in your enquiry

  • Target wavelengths and required transmission or blocking
  • Light source and detector model, or their spectra
  • Working angle, beam geometry and operating environment
  • Required shape, dimensions, thickness and mounting constraints
  • Sample quantity, expected order quantity and project timing

TECHNICAL RESOURCES

Take the data
into your design.

CTB-200 spectrum data CSV ↓KUPO Optics catalog Download ↗Explore Color Temperature Blue Filters →