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Color temperature conversion filters
Color Temperature Conversion Filters (CTO / CTB Color Correction)
Color temperature conversion filters (commonly categorized as CTO [Color Temperature Orange] and CTB [Color Temperature Blue] optical filters) are precision optical components designed to accurately transform daylight color temperatures to tungsten light baselines, or vice versa.
Functions:
Features inorganic dielectric thin-film coatings (PVD-EBGE) that precisely shift the light engine spectrum, converting daylight (~5600K) to tungsten (~3200K) or boosting warm tungsten to balanced daylight. Formulated on high-thermal-endurance glass substrates, these filters modify correlated color temperature in accurate Mired steps, correct spectral energy ratios, and guarantee zero color degradation or thermal shift under continuous high-temperature exposure up to 450°C–500°C.
Applications:
Entertainment light engines
Intelligent stage luminaires
Architectural spot illumination
High-precision color correction systems
Professional film and television studio lighting
#CTO25 #CTO50 #CTO75
#Information and Notes
ITEM NO: CTB25
Physical Characteristics
Glass: 1.1mm
Tempered Glass: 2, 3, 4, 5mm
Borosilicate: 1.1mm
Square: 8x8 - 220x220mm
Round: Dia8 - 210mm
*Tempered glass has a minimum size limit.
Resistant Temperature
Glass: 150℃
Tempered Glass:250℃
Borosilicate: 450℃
ITEM NO: CTB50
Physical Characteristics
Glass: 1.1mm
Tempered Glass: 2, 3, 4, 5mm
Borosilicate: 1.1mm
Square: 8x8 - 220x220mm
Round: Dia8 - 210mm
*Tempered glass has a minimum size limit.
Resistant Temperature
Glass: 150℃
Tempered Glass:250℃
Borosilicate: 450℃
ITEM NO: CTB75
Physical Characteristics
Glass: 1.1mm
Tempered Glass: 2, 3, 4, 5mm
Borosilicate: 1.1mm
Square: 8x8 - 220x220mm
Round: Dia8 - 210mm
*Tempered glass has a minimum size limit.
Resistant Temperature
Glass: 150℃
Tempered Glass:250℃
Borosilicate: 450℃
ITEM NO: CTO25
Physical Characteristics
Glass: 1.1mm
Tempered Glass: 2, 3, 4, 5mm
Borosilicate: 1.1mm
Square: 8x8 - 220x220mm
Round: Dia8 - 210mm
*Tempered glass has a minimum size limit.
Resistant Temperature
Glass: 150℃
Tempered Glass:250℃
Borosilicate: 450℃
ITEM NO: CTO25
Physical Characteristics
Glass: 1.1mm
Tempered Glass: 2, 3, 4, 5mm
Borosilicate: 1.1mm
Square: 8x8 - 220x220mm
Round: Dia8 - 210mm
*Tempered glass has a minimum size limit.
Resistant Temperature
Glass: 150℃
Tempered Glass:250℃
Borosilicate: 450℃
ITEM NO: CTO50
Physical Characteristics
Glass: 1.1mm
Tempered Glass: 2, 3, 4, 5mm
Borosilicate: 1.1mm
Square: 8x8 - 220x220mm
Round: Dia8 - 210mm
*Tempered glass has a minimum size limit.
Resistant Temperature
Glass: 150℃
Tempered Glass:250℃
Borosilicate: 450℃
ITEM NO: CTO75
Physical Characteristics
Glass: 1.1mm
Tempered Glass: 2, 3, 4, 5mm
Borosilicate: 1.1mm
Square: 8x8 - 220x220mm
Round: Dia8 - 210mm
*Tempered glass has a minimum size limit.
Resistant Temperature
Glass: 150℃
Tempered Glass:250℃
Borosilicate: 450℃
Information and Notes
1. Custom optical design services are available for color temperature conversion filters tailored to specific initial source and target converted color temperatures. Integrated heat reflection / hot mirror dielectric coatings can be combined on the same glass substrate to significantly enhance thermal insulation.
2. Spectral power distribution (SPD) characteristics vary according to light emitter technology. Clients are advised to specify the primary light engine type (e.g., LED, Halogen/Tungsten, Metal Halide, Gas Discharge / HID) to achieve optimal chromaticity shift precision.
3. Nominal color temperature conversion ratios relative to light engine source baselines:
4. Manufactured using Physical Vapor Deposition with Electron Beam Gun Evaporation (PVD-EBGE) technology, providing high coating density, excellent thermal endurance (withstanding temperatures up to 450°C–500°C), and long-term chromaticity stability without color shift.
5. Spectral transmittance curves represent measurements captured at normal incidence (0° angle of incidence).
6. Transmittance curves reflect actual sample measurement data and are subject to minor operational tolerances between manufacturing production runs while remaining within target optical specifications.
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