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Color temperature conversion filters
Color Temperature Conversion Filters (CTO / CTB Optics)
Color temperature conversion filters (also known as color correction filters, CTO [Color Temperature Orange], or CTB [Color Temperature Blue] optical glass) are precision thin-film optical components engineered to balance and modify the correlated color temperature (CCT) of artificial light sources.
Functions:
Adjusts the spectral power distribution (SPD) of light engines by selectively shifting output spectrums to either raise (cool/CTB) or lower (warm/CTO) color temperatures in precise Mired steps. Engineered via vacuum-deposited inorganic dielectric thin films (PVD-EBGE) on high-thermal-resistance glass substrates, these filters deliver exact chromaticity coordinates ($x, y$), maximize luminous flux transmission, and guarantee zero color degradation, aging, or thermal shift under sustained operation up to 450°C–500°C.
Applications:
Architectural lighting
Photographic light engines
Intelligent stage luminaires
Medical surgical illumination equipment
Professional film and television studio lighting
High-accuracy color rendering machine vision systems
#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 (CCT). Integrated hot mirror / heat insulation dielectric coatings can be combined on the same substrate to enhance thermal protection.
2. Spectral power distribution (SPD) characteristics vary significantly by emitter technology. Clients are advised to specify the primary light engine type (e.g., COB LED, Halogen/Tungsten, Metal Halide, High-Intensity Discharge / HID) to achieve optimal chromaticity 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 real sample measurement data and are subject to minor tolerances between manufacturing production runs while remaining within target spectral limits.
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