CTO-036 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: ~48.0 % T (visible range)
- Peak transmittance: ~96.0 % T near 737 nm
- Minimum transmittance: ~0.3 % T near 398 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-036 delivers a +100 Mired shift to move 5600 K light toward 3400 K. Its smooth spectral slope creates a natural warming effect, with about 48.0 % 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-036 is a sharp-edged deep-orange longpass with its 50 % crossover at 611 nm. Like CTO-035, it features clean UV-blue blocking (T < 5 % from 380-435 nm) and a steep transition, but the cut-on is shifted 10 nm deeper into the orange. Red transmission averages 86.1 % and NIR reaches 95.4 %, peaking at 96.0 % at 737 nm. Blue and green wavelengths are held to low averages of 20.8 % and 23.7 % respectively. The clean profile with deep blocking and high red-NIR throughput makes CTO-036 ideal for applications requiring a pure deep-orange longpass.
Key Advantages
- Sharp UV-blue blocking (T < 5 % from 380-435 nm) - eliminates all short-wavelength leakage for a pristine deep-orange output.
- 50 % crossover at 611 nm - positions the transition in the deep-orange region for a stronger warm shift than standard CTO.
- Peak of 96.0 % at 737 nm with NIR avg 95.4 % - delivers excellent red and NIR efficiency.
- 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 concert lighting - creates a clean, deep orange-red wash with no blue-violet leakage for immersive warm-scene design.
- Film lighting and colour correction - provides a heavy daylight-to-tungsten conversion with a precise, artefact-free spectral profile.
- Architectural and display lighting - transforms cool-white LED sources into deeply warm accents for high-end hospitality and retail.
- Machine vision orange-red longpass - provides a well-defined 610 nm edge for wavelength-selective imaging, sorting, and inspection.
- Biomedical optical windows - selects the tissue-penetrating orange-red and NIR bands while blocking shorter wavelengths that scatter at the surface.
Need prototypes in days or production volumes next quarter? CTO-036 filters can be coated, diced, and shipped to your exact specifications.
FAQ
CTO-036 FAQ
What is CTO-036 and what is it used for?
CTO-036 is a Color Temperature Orange Filter - Sharp Deep Orange (T50 % = 609 nm). CTO-036 is a sharp-edged deep-orange longpass with its 50 % crossover at 611 nm. Like CTO-035, it features clean UV-blue blocking (T < 5 % from 380-435 nm) and a steep transition, but the cut-on is shifted 10 nm deeper into the orange. Common uses include Stage and concert lighting, Film lighting and colour correction, Architectural and display lighting, and Machine vision orange-red longpass.
What are the key optical specs of CTO-036?
Key published specs for CTO-036 include Colour shift direction: Warming (5600 K → 3400 K); Mired shift: +100 Mired; Correction strength: 3/4 CTO; Average transmittance: ~48.0 % T (visible range); Peak transmittance: ~96.0 % T near 737 nm.
What applications is CTO-036 best suited for?
CTO-036 is commonly used for Stage and concert lighting, Film lighting and colour correction, Architectural and display lighting, and Machine vision orange-red longpass. Stage and concert lighting - creates a clean, deep orange-red wash with no blue-violet leakage for immersive warm-scene design.
Can CTO-036 be customized for size, substrate, or coating requirements?
KUPO lists the construction for CTO-036 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-036?
The ion-assisted hard-oxide coating is built for repeated handling, heat, and cleaning.
