Sekonic C-4000 SpectroMeter
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Spectrometer Sekonic C-4000
Sekonic C-4000 represents the pinnacle of precision, reliability, and technological advancement in the field of light measurement. It is designed to meet the highest demands of professional production while making everyday work easier thanks to its intuitive interface and fast data processing. If you want to truly take control of light and elevate the quality of your work to the next level, the Sekonic C-4000 is an investment that will pay off in the form of consistent and professional results.
Main Features
- Precise measurement of the visible spectrum (380–780 nm) with 1 nm resolution
- Color temperature (CCT): determination of precise light temperature in Kelvin and Δuv deviations
- CRI and TLCI: evaluation of color rendering quality according to international standards
- SSI and TM-30-18: advanced analysis of spectral match and qualitative color rendering
- Light intensity measurement: in lux (lx), foot-candles (fc), or candela/m²
- Calculation of correction filters: recommendation of appropriate CTO, CTB, or green filters for precise light balancing
- Built-in memory: storing measurements with option to transfer to computer or mobile device
- Touch LCD display: large, readable full-color display with simple and fast operation
- USB and Bluetooth connectivity: convenient connection to software for data management and analysis
- Robust construction: durable body suitable for demanding fieldwork and on-set use
Accuracy and Reliability in Every Measurement
The Sekonic C-4000 Spectrometer uses an advanced spectral sensor that measures light across a wide range of wavelengths with high precision. The device provides a detailed analysis of color temperature (CCT), light spectral distribution, and CRI values (Color Rendering Index) as well as TLCI (Television Lighting Consistency Index), which is crucial for professional work with cameras or photography. In addition to the standard CRI, which evaluates color fidelity under artificial lighting, the C-4000 also analyzes modern indices such as SSI (Spectral Similarity Index) and TM-30-18, giving you access to the most up-to-date lighting standards.
CIE 1931
CIE 1931 is a color space based on tristimulus values, which are mathematically derived from color measurements. They represent red, blue, and green light and theoretically represent the standard observer's eye. CIE 1931 values are indicated using the x, y coordinates.
CRI Color Rendering Index
The CRI Color Rendering Index measures the ability of a light source to reveal the colors of objects compared to a natural light source, such as the sun. Ra is the average of eight out of fifteen CRI values, providing a general assessment of the light source’s color rendering capability.
Spectrum
The spectrum shows the spectral distribution of the measured light source in a graph with relative or absolute intensity depending on the wavelength. The graph can be displayed, printed, and saved via the SEKONIC LD App.
TM-30-18
TM-30-18 is a color rendering index system published by the IES (Illuminating Engineering Society), which indicates how accurately a light source will reproduce the color of an object (compared to a blackbody radiator, e.g., the sun).
Compact and lightweight device for professionals
The Sekonic C-4000 spectrometer was designed specifically for lighting designers and field technicians, offering a compact, lightweight, sophisticated, and affordable solution for lighting professionals. Its uniqueness lies in the ability to operate on two platforms. The C-4000 provides basic numerical data directly from the device but also supports wireless remote measurement via the Sekonic LD App on a smartphone or tablet, offering extensive functionality.
Who is the Sekonic C-4000 Spectrometer ideal for?
- Filmmakers and cinematographers: precise light setup for consistent color tones between scenes
- Photographers: optimization of studio lighting for faithful color reproduction
- Lighting technicians: proper selection and calibration of light sources in theater productions or live events
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Set designers and lighting designers: designing and verifying lighting setups according to the desired
spectral profile
Thanks to its versatility, wide compatibility with different types of light sources (LED, HMI, fluorescent, incandescent), and clear display of measured values, the Sekonic C-4000 becomes an indispensable tool for every professional.
User comfort and modern technology
Sekonic has placed great emphasis on user-friendliness. Operating the C-4000 is intuitive thanks to its logically structured interface and touch control. Quick calibration and the ability to customize displayed values allow you to work more efficiently without time-consuming adjustments. The device also supports firmware updates, ensuring compatibility with new types of light sources and standards that constantly emerge in the rapidly evolving lighting industry.
SEKONIC LD App
With the enhanced paid version of the Sekonic LD App, you have a range of features and functions at your fingertips that ensure a smooth and convenient workflow. Compatible with Apple or Android smartphones and tablets, the app perfectly extends the C-4000 spectrometer experience – from quick and easy measurement and recording to real-time shared reports.
- Import drawings/photos – Use your smartphone to capture drawings or photos of the site.
- Record measurement directly on drawing or image – Measured values can be easily placed on the imported image. Optional units for each measured point may include lx, K (Kelvin), uv, Ra, Rf/Rg, x.y.
- GPS coordinates of measurement site – Measurements can be saved with linked GPS coordinates for easy retrieval or localization on-site. Included along with other important details in the location report.
- App-ready report – Create PDF or CSV reports in the SEKONIC LD App. Reports include GPS location, site image or captured drawing with values, detailed data in CSV format, and Spectrum, CRI, TM-30-18, and CIE 1931 graphs for each light source.
- Adding notes/images in real-time – Special lighting situations requiring detailed notes and images can be documented during the measurement process. Images can be taken on-site or linked to stored images.
- Sharing data from the SEKONIC LD App – Quickly and easily share logs, measurement data with notes and images via smartphone or tablet.
Specifications
- Brand: Sekonic
- Model: C-4000
- Purpose: Light meter
- Image sensor: CMOS
- Measured wavelength range: 380 nm to 780 nm
- Measurement range – Illuminance: 5 lx to 10,000 lx (0.46 fc to 929 fc), color temperature 1,600 K to 40,000 K
- Accuracy (Light source A): Illuminance ± 5 % ± 1 digit (5 lx to 3,000 lx), ± 7.5 % ± 1 digit (>3,000 lx), x, y: ±0.003 (800 lx)
- Special characteristics (f1'): 9 % or less
- Oblique incidence characteristics (f2): 12 % or less
- Power supply: AA battery (1.5 V) x 2, USB bus power
- Measurement time: Max. 15 s, Min. 2 s
- Display values: Illuminance (lx), Tcp (K), uv, CRI (Ra), TM-30 (Rf, Rg), chromaticity coordinates (x, y)
- Additional functions: Data memory up to 99 entries, Auto power off, Auto dimming
- Language selection: English, French, German, Italian, Spanish or Japanese
- Interface: USB connector (Type C), Bluetooth
- Operating temperature: 5 °C to 35 °C, no condensation
- Operating humidity: 85 % or less (at 35 °C), no condensation
- Transportation and storage conditions: -10 °C to 60 °C, relative humidity 85 % or less (at 35 °C), no condensation
- Dimensions: approx. 62 mm (W) x 140 mm (H) x 30 mm (D)
- Weight: 140 g (without batteries)
- Included accessories: Light receptor cap, Soft case, Strap
- Power source: 1.5V x 2 (AA battery) + USB-C port
- Display: 2.7" color touch LCD with backlight
Repeatability (2σ, Light source A)
- Illuminance: 1 % + 1 digit (30 lx to 10,000 lx), 5 % + 1 digit (5 lx to 29.9 lx)
- x, y: 0.001 (500 lx to 10,000 lx)
- x, y: 0.002 (100 lx to 499 lx)
- x, y: 0.004 (30 lx to 99.9 lx)
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x, y: 0.008 (5 lx to 29.9 lx)
Temperature characteristics – Illuminance
- ± 5 %
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x, y: ± 0.006 (Light source A, 1,000 lx)
Humidity characteristics – Illuminance
- ± 3 %
- x, y: ± 0.006 (Light source A, 1,000 lx)
Contents of the package
- 1x Sekonic C-4000
- 1x Quick start guide
- 1x Strap
- 1x Soft case
- 1x Safety instructions
I have a question about the product Sekonic C-4000 SpectroMeter
Two-Year Warranty for Business and Retail Customers
We stand behind the quality of our products, which is why FOMEI provides a two-year warranty (24 months) on this product from the date of purchase, fully valid for both individuals and business customers purchasing under their business ID.
Any defects are handled directly in Hradec Králové, where we operate a fully equipped professional electronics service center with a team of trained technicians ensuring fast and high-quality repairs.
Our technical center has an extensive stock of spare parts, so repairs are normally carried out quickly without delays. We understand the situation of professionals for whom photographic equipment is a main source of income, which is why we offer the possibility of lending an equivalent replacement product for the entire duration of warranty repairs.
Consumable Material
If the package or delivery includes consumables (e.g., bulb, tube, flash tube, battery), their lifespan is indicated on the product, packaging, manual, or warranty card. If not specified, the lifespan is 6 months.
Post-Warranty Service
Our products do not end their life when the warranty expires. Thanks to the quality of parts and supplier stability, our flashes have typical repairability for more than 10 years from the date of sale. Most defects are repaired rather than simply replaced. We handle both electronic and physical damage.
Our team of service technicians