CTO-049 Color Temperature Orange (Warming) Filter

CTO-049 delivers a standard half-CTO shift with its 50 % crossover at 564 nm and solid warm-band performance. Red averages 91.4 % with a peak of 93.7 % at 675 nm, while NIR averages 88.4 %. Blue is suppressed to 17.4 % and green to 34.4 %. Yellow (60.3 %) and orange (75.8 %) show a smoothly rising transition. The profile is a textbook half-CTO: predictable, smooth, and efficient, suitable for standard colour-temperature conversion tasks.

Key Advantages

• Standard half-CTO crossover at 564 nm - provides the industry-standard half-CTO conversion for predictable colour-temperature shifts.
• Peak of 93.7 % at 675 nm - delivers high efficiency in the deep-red region most visible to the eye.
• Smooth, predictable transition - produces a textbook CTO curve ideal for accurate colour-temperature planning.
• Hard-oxide durability - ion-assisted coating resists heat, humidity, solvents, and cleaning.
• Custom formats available - round, square, or free-form blanks from 5 mm to 450 mm, thickness 0.21-3.8 mm, on Borofloat®, soda-lime, Schott D263 T, or Corning Eagle XG substrates.

Typical Applications

• Stage and event lighting - provides the go-to half-CTO conversion for standard daylight-to-tungsten colour matching.
• Film and broadcast production - delivers a reliable half-CTO for balancing mixed lighting setups.
• Architectural and retail lighting - shifts cool-white LED fixtures to warm-white at a predictable, calibrated level.
• Photography colour correction - provides standard half-CTO for in-camera warm balancing under mixed or cool-dominant lighting.
• LED module colour tuning - converts standard 5600 K LED modules toward approximately 3800-4200 K with a single filter element.

Need prototypes in days or production volumes next quarter? CTO-049 filters can be coated, diced, and shipped to your exact specifications.