CTO-054 Color Temperature Orange (Warming) Filter
Full CTO colour-conversion filter shifting 5600 K toward 3200 K for seamless mixed-lighting balance in broadcast, film, and architectural applications.
- Colour shift direction: Warming (5600 K → 3200 K)
- Mired shift: +131 Mired
- Correction strength: Full CTO
- Average transmittance: ~45.1 % T (visible range)
- Peak transmittance: ~96.4 % T near 745 nm
- Minimum transmittance: ~2.1 % T near 456 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-054 delivers a +131 Mired shift to move 5600 K light toward 3200 K. Its smooth spectral slope creates a natural warming effect, with about 45.1 % average visible transmittance and approximately 1.5 stops of light loss.
The ion-assisted hard-oxide coating is built for repeated handling, heat, and cleaning.
Best suited for:
Full daylight-to-tungsten conversion on HMI or daylight LED fixtures, mixed-light interiors, and scenes that need a strong warm match.
Description
CTO-054 is a sharp-edged deep orange-red longpass with its 50 % crossover at 621 nm and excellent NIR performance. UV-blue is well suppressed, with a blocking notch at 436-473 nm (T < 5 %), and green averages just 14.5 %. Above the transition, transmission rises steeply to 85 % by 653 nm, reaching a peak of 96.4 % at 745 nm. NIR averages an exceptional 94.7 %. The clean, steep transition and high plateau make CTO-054 one of the most efficient deep-red longpass CTOs in the series.
Key Advantages
- Steep 50 % crossover at 621 nm with T > 85 % by 653 nm - delivers a sharp transition into the deep orange-red passband with rapid rise to full throughput.
- Peak of 96.4 % at 745 nm with NIR avg 94.7 % - provides the highest red-NIR efficiency of any deep CTO in the series.
- Deep blue blocking (T < 5 % at 436-473 nm) - cleanly removes the blue peak of LED sources.
- 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 concert lighting - creates a deep, saturated orange-red wash with steep edge definition and maximum output efficiency.
- Film and broadcast heavy CTO - provides strong daylight-to-tungsten conversion with a clean, professional spectral profile.
- Machine vision and sensing - functions as a high-performance 620 nm longpass for red-NIR wavelength-selective imaging.
- Biomedical and tissue imaging - passes the therapeutic window (> 620 nm) for deep-tissue penetration while blocking shorter scattering wavelengths.
- Horticultural far-red supplementation - delivers the red and far-red bands essential for phytochrome-mediated flowering and growth regulation.
Need prototypes in days or production volumes next quarter? CTO-054 filters can be coated, diced, and shipped to your exact specifications.
FAQ
CTO-054 FAQ
What is CTO-054 and what is it used for?
CTO-054 is a Color Temperature Orange Filter - Sharp-Edge Deep Orange-Red (T50% = 621 nm). CTO-054 is a sharp-edge deep orange-red filter with its 50 % crossover at 621 nm, providing strong blocking across the entire blue-green-yellow spectrum. Violet averages 3.6 %, blue 4.0 %, green 5.2 %, yellow 13.6 %, and orange 54.1 %, before climbing steeply to red at 91.0 % and peaking at 95.1 % at 703 nm. Common uses include Stage deep red-orange effects, Film amber and fire simulations, Scientific long-pass edge filtering, and Machine vision deep orange/red isolation.
What are the key optical specs of CTO-054?
Key published specs for CTO-054 include Colour shift direction: Warming (5600 K → 2900 K); Mired shift: +172 Mired; Correction strength: 1.5× CTO; Average transmittance: ~36.7 % T (visible range); Peak transmittance: ~95.1 % T near 703 nm.
What applications is CTO-054 best suited for?
CTO-054 is commonly used for Stage deep red-orange effects, Film amber and fire simulations, Scientific long-pass edge filtering, and Machine vision deep orange/red isolation. Stage deep red-orange effects - delivers a rich deep amber-red for dramatic fire effects and warm scene design.
Can CTO-054 be customized for size, substrate, or coating requirements?
KUPO lists the construction for CTO-054 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-054?
The ion-assisted hard-oxide coating is built for repeated handling, heat, and cleaning.
