The Spectrometer C-4000 is purpose-built for lighting designers and field technicians who demand precision, flexibility, and efficiency. Merging trusted, industry-grade light measurement technology with the power and convenience of modern smartphones, the C-4000 redefines what a light meter can be.
Compact, lightweight, and highly sophisticated, the C-4000 delivers a professional-grade solution that’s both accessible and easy to use—making it an ideal tool for real-time light evaluation and management on set or in the field.
- Measuring Color Temperature (TCP) from 1,600K to 40,000K
- 2.7" Color Touchscreen
- Provides Light Quality information such as Ra, 𝛥uv, Lux/fc, TM-30-18 (Rf, Rg), Chromaticity coordinates (x,y) etc.
- Smart Device App ready
- Continuous/Single measurements
- USB-C connectivity for firmware updates via the Sekonic utility
Featuring a vibrant 2.7” color touchscreen, Bluetooth® wireless connectivity, and seamless compatibility with both Apple® and Android™ devices, the C-4000 offers unmatched flexibility for sharing and analyzing light data on the go. Whether you're taking quick standalone readings or using the free SEKONIC LD App for remote control and basic functions—or unlocking deeper features like graph plotting through the advanced paid app—you’re always in control.
Key measurements include full-color spectrum graphs, CRI, TM-30-18, and CIE 1931 chromaticity coordinates (x, y). These are displayed in high resolution on your smart device, where you can also store, adjust, and review data, settings, and configurations with ease.
Share insights instantly with colleagues and clients through screenshots, detailed real-time reports, and geo-tagged images.
The C-4000 is more than just a light meter—it’s a complete mobile solution for precision lighting analysis and professional collaboration, whether you're onsite or working remotely.
Simplified and clear display information
The 2.7” color touch screen display offers an intuitive navigation through various features and modes. Its basic numeric feedback and selectable color and illumination measurements offer a quick and accurate analysis of the lighting scenario.
Compact, portable ad ergonomic design
Responding to a growing need for a smaller and more ergonomic designed meter, the C-4000 fits comfortably in the palm of your hand. Measuring 140 mm x 62 mm, and weighing 140 grams (without batteries), it is perfect for handheld or pole mounted measurements. Both the power and measuing buttons are positioned in a natural configuration to complement handheld comfort.
Sekonic LD Free App
The real magic happens when the C-4000 is connected to the Sekonic LD Free App. Utilizing Bluetooth connectivity along with smartphone or tablet compatible (Apple ® or Android ™), remote-control measurements are transferred to your smart device. View graphs of measurements, import stored data, configure settings and View CIE 1931, Spectrum, CRI and TM-30-18 color rendering properties.
Sekonic LD Paid App
With the Sekonic LD upgraded PAID version of the App, a variety of features and functions are available at your fingertips providing a smooth and convenient workflow. From a quick and easy measure and record process to sharable measurement reports on the fly, the Sekonic LD upgrade App compatible with Apple ® or Android ™ smartphones or tablets offers the perfect extension to your C-4000 Spectrometer experience.
Specifications
- Meter Type: Spectrometer
- Light Readings: CIE1931/CIE1964, CRI (Color Rendering Index), Lux
- Measuring Modes: Spectrum Graphics
- Display: 2.7" / 6.9 cm Touchscreen LCD
- System Connection; USB-C
- Illuminance Range: 5 to 10,000 Lux / 0.5 to 929 fc
- Color Temperature Range: 16,000 to 40,000K
- Exposure Memory: Yes, 99 Readings
- Receptor Element: CMOS
- Operating Conditions: 5 to 35°C
- Storage Conditions: -10 to 60°C
- Battery: 2x AA
- Wireless: Bluetooth
- Dimensions: 140 x 62 mm
- Weight: 140 g (without Batteries)
