CL550i
Spectral and temporal
precision for modern lighting

Light in commercial and architectural environments is no longer judged by brightness alone. True light quality is defined by spectral composition, temporal stability and the way illumination is experienced by the human eye. The OBSIDIAN CL550i was purpose-built as a spectro flicker meter, engineered specifically to measure both the spectral content of light and its behavior over time with scientific accuracy and professional reliability.

Developed for lighting consultants, manufacturers, R&D teams, universities and research institutions, the CL550i delivers a complete and defensible understanding of light performance in a single instrument. It reveals not only what light contains, but how it performs in real environments where visual comfort, compliance and quality matter.

Extending Beyond
the Visible Spectrum

A defining characteristic of the CL550i is its spectral sensitivity from 300 to 800 nanometers. This range spans the entire visible domain while extending into the near ultraviolet region, an area increasingly relevant in modern light sources, materials, optics and perception studies.

By capturing this extended spectrum, the CL550i provides a more complete and accurate representation of light than conventional meters limited strictly to visible wavelengths. This capability is particularly valuable in architectural lighting, where materials, finishes and spatial perception are influenced by subtle spectral variations that standard instruments often fail to detect.

Understanding How Light
Behaves Over Time

The CL550i was specifically engineered to analyze temporal light behavior alongside spectral measurement. Subtle fluctuations, modulation patterns and flicker characteristics can have a direct influence on comfort, concentration and perceived quality. As a dedicated spectro flicker meter, the CL550i exposes these dynamics with clarity, allowing professionals to evaluate driver performance, luminaire stability and overall lighting integrity.

This makes the instrument exceptionally powerful for audits, quality control, design validation and research applications where stable, comfortable and compliant lighting is essential.

CL550i
Spectral and temporal
precision for modern lighting

One user interface designed
for every professional

The CL550i adapts to the way professionals work through a carefully structured user interface divided into three dedicated modes.

Basic Mode provides immediate access to essential lighting parameters for daily field use and client consultations. Scientific Mode unlocks full analytical depth for laboratory research, engineering analysis and development work. Inspector Mode is optimized for structured quality checks, lighting audits and compliance verification, enabling consistent documentation and reliable assessments in real environments.

This user centered architecture ensures that the right information is always presented for the task at hand, without unnecessary complexity or compromise.

Engineered for Architectural
Lighting Excellence

Architectural lighting demands more than measurements. It requires understanding how light interacts with surfaces, materials, human perception and spatial design. The CL550i is exceptionally well suited for this domain, providing consultants and designers with the tools to evaluate lighting quality in offices, public buildings, retail spaces, museums, hospitality environments and industrial architecture.

By combining extended spectral insight with advanced flicker analysis, the CL550i allows professionals to design and validate lighting installations that meet the highest standards of visual comfort, aesthetic quality and performance.

One Instrument.
Complete Lighting Insight.

By uniting extended spectral sensitivity, advanced temporal light analysis and a user interface designed for real professional use, the OBSIDIAN CL550i sets a new benchmark in commercial and architectural lighting measurement.

It does more than measure light.

It reveals how light truly performs in the spaces where people live, work and experience their environment.

PRODUCT SPECIFICATIONS ( 350 nm to 800 nm )

Product specifications

  • Sensor High Precision Multi CCD sensor Architecture
  • Illuminance meter class Directional response conforms DIN 5032 Class B
  • Illuminance accuracy Class 1 ±3% (Class 1)
  • Wavelength Range 350 nm to 800 nm
  • Wavelengte Accuracy ±0.5 nm
  • Cosine corrector 15mm
  • Stray Light ≤ 0.5%
  • Spectral Bandwidth (FWHM) 2nm
  • Illuminance Range 5 lx – 200 klx
  • X,Y repeatability ±0.0005
  • Chromaticity Coordinate Accuracy ±0.0025.
  • CCT Range 1,000 K – 100,000 K
  • Integration Time 50 µs – 10,000 ms
  • Display 3.5-inch capacitive touchscreen display
  • Connectivity Bluetooth / USB-C / Modbus RS-485
  • Bluetooth connection distance sensor 0~10m (accessibility)
  • Storage capacity 4 gb
  • Product dimensions 138 x 61 x 23.4 mm
  • Device weight Device + sensor head: 194 g
  • Sensor head (separate) 70 g

MEASURED PARAMETERS

  • LUX – Eᵥ (lx) Illuminance
  • CCT (K) Correlated Color Temperature
  • CRI – Rₐ Color Rendering Index
  • R1–R15 CIE General Color Rendering Indices
  • Fc (fc) Footcandle
  • SPD (W/nm) Spectral Power Distribution
  • S/P Ratio Scotopic/Photopic Ratio
  • λₚ Peak Wavelength
  • λₚ(V) Peak Wavelength (Photopic Weighted)
  • λ_d Dominant Wavelength
  • D_uv Distance from Planckian Locus
  • TM30-24 CES 01/99 IES TM-30 Color Fidelity and Gamut Rf / Rg (TM-30)
  • x, y (CIE 1931) CIE 1931 Chromaticity Coordinates
  • u′, v′ (CIE 1976) CIE 1976 UCS Chromaticity Coordinates
  • u, v (CIE 1960) CIE 1960 UCS Chromaticity Coordinates
  • SDCM (MacAdam) Standard Deviation of Color Matching
  • CQS Color Quality Scale
  • GAI Gamut Area Index
  • TLCI Television Lighting Consistency Index
  • Irradiance Eₑ (W/m²) Spectral Irradiance (350–800 nm)
  • COI Cyanosis observation Index
  • SDCM BIN (ANSI/NEMA C78.377-2024)

Flicker & Frequencies

  • Flicker Risk - IEEE PAR1789 IEEE 1789 Flicker Risk Assessment
  • Flicker Index Flicker Index
  • Flicker percentage Percent Flicker (Modulation Depth)
  • Flickercycle (ms) Flicker Period
  • Freq (Hz) Flicker Frequency
  • DutyCycle % Duty Cycle
  • SVM * Stroboscopic Visibility Measure
  • PstLM * Short-Term Light Modulation Indicator IEC 61000-4-15
  • * available in the extended Excel file.

Human Centric Lighting (HCL)

  • mEDI (lx) Melanopic Lux
  • Eₑ,mel (W/m²) MEL Irradiance
  • Daylight Illuminance for Melatonin MEL Daylight Lux
  • Percentage of Illuminance for Melatonin Melanopic Ratio
  • Eᵣ Rhodopic Lux
  • E_c Chloropic Lux
  • E_e Erythropic Lux
  • E_cy Cyanapic Lux
  • Melanopic Daylight Efficacy Ratio MDER
  • Equivalent Melanopic Lux (WELL standard) EML

Blue Light Hazard

  • EB W/m2 Blue Light Weighted Irradiance
  • Kbv W/lm Blue Light Hazard Efficacy
  • RG Risk Group (IEC 62471)
  • BL% Blue Light Hazard Ratio
  • RG 0 Exempt Group
  • RG 1 Low Risk Group
  • RG 2 Moderate Risk Group
  • RG 3 High Risk Group

WELL – BREEAM GRID

  • LUX
  • Menalopic LUX / MEDI / EDI
  • EML
  • CCT
  • CRI
  • TM-30
  • SVM
  • S/P Ratio
  • SPD
  • Flicker risk
  • Frequency

THE POWER OF FREEDOM:
A remotely operated
detachable sensor head.

A BREAKTHROUGH IN OPTICAL MEASUREMENT

One of the most defining innovations within the CL550i ecosystem is the detachable sensor head, a breakthrough that fundamentally reshapes how professionals measure light. Instead of maneuvering an entire handheld instrument into place, users can position the sensor independently and operate it completely from the base platform. This creates a new level of freedom, precision and control that sets the PG550i apart from traditional spectrometers. What may appear as a convenience feature is, in practice, a transformative leap in workflow efficiency, measurement accuracy and user safety.

TRUE STAND ALONE FUNCTIONALITY

The sensor head is engineered as a fully capable stand alone unit. It can operate either wired or wireless depending on the user’s environment and needs. In a wired configuration, the USB C connection provides stable power and continuous data transfer. In wireless mode, Bluetooth communication enables precise measurements from a distance without any physical interaction. Regardless of how it is connected, the sensor maintains the same level of scientific reliability. It can be placed inside luminaires, within multi layer growing systems or directly at canopy height without moving the main device.

WIRELESS CONTROL FROM THE BASE PLATFORM

A defining advantage of the CL550i is that the detachable sensor head remains fully controllable from the base instrument. Users can initiate measurements, adjust settings and monitor real time data remotely. This capability allows readings in locations that are difficult, time consuming or unsafe to access. The CL550i becomes the central command platform, while the sensor acts as a precision satellite collecting data exactly where it matters most.

CONNECTIVITY BUILT FOR PROSESSIONAL ENVIRONMENTS

The detachable sensor head is equipped with a complete suite of modern communication options. Bluetooth supports wireless and mobile operation. USB C provides high speed data transfer and continuous power delivery. MODBUS RS485 makes integration with PLC systems and automated environments effortless. This range of connectivity positions the CL550i perfectly for scientific research, horticultural operations, quality control workflows and industrial monitoring.

OPTIMIZED FOR REAL WORLD MEASUREMENT SCENARIOS

To enhance its practical use, the detachable sensor head can be mounted on the included aluminum tripod for stable, fixed position measurements. For extended reach or overhead applications, the sensor can be positioned on the extended measuring stick with its dedicated bracket. This allows users to capture readings above cultivation tables, deep inside lighting structures or across vertical rack systems with minimal effort.
When long duration measurements are required, the sensor head can be powered directly by the included powerbank, ensuring extended operation during prolonged research sessions, continuous monitoring or fieldwork away from fixed power sources. These accessories transform the sensor head into an adaptable, professional grade measurement tool capable of meeting any environmental challenge, from greenhouse aisles to laboratory setups and elevated lighting structures.

“This isn’t simply
a feature.
It’s the future of light
measurement.“

ACCESSING THE INACCESSIBLE

By separating the sensor from the main instrument, entirely new measurement possibilities emerge. Heights, confined spaces, delicate crop zones or heavily illuminated fixtures can be assessed safely and easily. The sensor goes directly to the light source while the user remains comfortably positioned at the base platform. This approach not only improves measurement accuracy but also significantly enhances safety, ergonomics and workflow efficiency.

A NEW STANDARD IN MEASUREMENT FLEXIBILITY

This modular architecture represents the core design philosophy of OBSIDIAN, which is freedom where it matters and precision where it counts. No competing system offers a detachable, remotely operated, stand alone sensor head with wireless control, industrial connectivity and full integration with tripod solutions, extension tools and portable power. The CL550i establishes a new benchmark for what professionals can expect from a spectrometer, an instrument that adapts effortlessly to the user, the application and the environment.

A Complete Measurement ECoSystem, Protected and Ready to go

Every OBSIDIAN instrument is delivered in a rugged, pressurised protective case designed to safeguard precision equipment in demanding environments. The case is engineered to provide maximum protection during transport, storage and field use, ensuring that the spectrometer remains stable and reliable wherever measurements are performed. The integrated pressure valve allows safe air pressure equalisation, making the case suitable for travel and variable environmental conditions.

Inside the case, the OBSIDIAN spectrometer is securely positioned alongside a carefully selected set of essential accessories. The included tripod enables stable and repeatable measurements in fixed positions, while the extended measurement stick allows effortless access to elevated or hard to reach light sources. When equipped with the detachable wireless Bluetooth sensor, the extended measurement stick enables fully wireless measurements, allowing the sensor to be positioned precisely where the light is measured while the instrument is operated remotely. 

For extended field sessions and long duration measurements, the included powerbank ensures uninterrupted operation without reliance on external power. A dedicated touch pen is included for precise and comfortable operation of the touchscreen in any environment, while a microfiber cleaning cloth allows the instrument and display to be cleaned and maintained with care.

Together, these components elevate the OBSIDIAN spectrometer into far more than a regular measuring instrument. It becomes a fully integrated, mobile measurement solution designed for real world professional use. From transport and setup to long duration field measurements and advanced remote operation, every element works together to ensure reliability, flexibility and precision wherever light needs to be understood.

OBSIDIAN SPECTROMETER INCLUDING ACCESSORIES

ALUMINUM MINI TRIPOD

65W 20.000 MAH POWERBANK

EXTENSION STICK

OBSIDIAN CAPACITIVE TOUCH PEN