CTO-041 Color Temperature Orange (Warming) Filter
3/4 CTO colour-conversion filter shifting 5600 K toward 3400 K for seamless mixed-lighting balance in broadcast, film, and architectural applications.
- Colour shift direction: Warming (5600 K → 3400 K)
- Mired shift: +100 Mired
- Correction strength: 3/4 CTO
- Average transmittance: ~51.8 % T (visible range)
- Peak transmittance: ~86.9 % T near 650 nm
- Minimum transmittance: ~8.9 % T near 424 nm
- Construction: Ion-assisted hard-oxide; 5 – 450 mm shapes, 0.21 – 3.8 mm thick
- Custom options: Intermediate Mired shifts, combined CTO+diffusion, custom sizes, rapid prototypes
Learn more
CTO-041 delivers a +100 Mired shift to move 5600 K light toward 3400 K. Its smooth spectral slope creates a natural warming effect, with about 51.8 % average visible transmittance and a low amount of light loss.
The ion-assisted hard-oxide coating is built for repeated handling, heat, and cleaning.
Best suited for:
Strong but not full warming when you want a natural blend between daylight and tungsten sources.
Description
CTO-041 delivers a medium-strength warm shift with its 50 % crossover at 560 nm and a moderate peak transmission of 86.9 % at 650 nm. The profile suppresses violet to 10.2 % and blue to 13.4 %, while green averages 34.7 %. Transmission builds through yellow (64.1 %) and orange (77.9 %) to a red average of 85.2 %. The NIR band (700-800 nm) averages 79.4 %. The moderate peak and smooth profile suit applications where a natural, restrained warm shift is preferred over maximum saturation.
Key Advantages
- 50 % crossover at 560 nm with moderate peak of 86.9 % - delivers a natural, restrained warm shift that avoids over-saturation.
- Strong violet-blue suppression (avg < 14 %) - effectively removes cool tones for a clean warm palette.
- Smooth, natural spectral curve - produces a warm output that mimics the gradual spectral roll-off of an incandescent source.
- Hard-oxide durability - ion-assisted coating withstands high lamp 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 architectural lighting - adds a moderate, natural-looking warmth to daylight-balanced fixtures without over-saturating the output.
- Film and television production - provides subtle tungsten simulation for matching LED fixtures to incandescent practicals on set.
- Retail and hospitality ambiance - shifts cool-white sources toward a warm-white appearance with a natural, inviting quality.
- Photography colour correction - delivers a moderate in-camera warming effect for overcast-day and shade photography.
- Museum and gallery lighting - gently warms exhibition lighting while maintaining acceptable colour rendering for artwork display.
Need prototypes in days or production volumes next quarter? CTO-041 filters can be coated, diced, and shipped to your exact specifications.
FAQ
CTO-041 FAQ
What is CTO-041 and what is it used for?
CTO-041 is a Color Temperature Orange Filter - Medium Warm Shift (T50 % = 560 nm). CTO-041 delivers a medium-strength warm shift with its 50 % crossover at 560 nm and a moderate peak transmission of 86.9 % at 650 nm. The profile suppresses violet to 10.2 % and blue to 13.4 %, while green averages 34.7 %. Common uses include Stage and architectural lighting, Film and television production, Retail and hospitality ambiance, and Photography colour correction.
What are the key optical specs of CTO-041?
Key published specs for CTO-041 include Colour shift direction: Warming (5600 K → 3400 K); Mired shift: +100 Mired; Correction strength: 3/4 CTO; Average transmittance: ~51.8 % T (visible range); Peak transmittance: ~86.9 % T near 650 nm.
What applications is CTO-041 best suited for?
CTO-041 is commonly used for Stage and architectural lighting, Film and television production, Retail and hospitality ambiance, and Photography colour correction. Stage and architectural lighting - adds a moderate, natural-looking warmth to daylight-balanced fixtures without over-saturating the output.
Can CTO-041 be customized for size, substrate, or coating requirements?
KUPO lists the construction for CTO-041 as Ion-assisted hard-oxide; 5 – 450 mm shapes, 0.21 – 3.8 mm thick. Published custom options include Intermediate Mired shifts, combined CTO+diffusion, custom sizes, rapid prototypes. 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.
What should I know about angle of incidence and durability for CTO-041?
The ion-assisted hard-oxide coating is built for repeated handling, heat, and cleaning.
