PG400i UV - VIS
Full spectrum insight
for advanced horticulture.

FROM VISIBLE LIGHT TO
THE COMPLETE UV SPECTRUM

As horticulture continues to evolve, so does the understanding of how light influences plant physiology. Beyond the visible spectrum, ultraviolet radiation plays an increasingly important role in crop quality, morphology, secondary metabolite production and plant defense mechanisms. The PG400i UV was developed to meet this growing demand for deeper spectral insight.

The PG400i UV is the successor to the PG300i and extends its capabilities by combining VIS and UV measurements into a single, unified instrument. With a sensor wavelength range from 220 nanometers to 800 nanometers, the PG400i UV captures both ultraviolet and visible light in one continuous measurement. This enables professionals to fully understand how UV and VIS interact and influence plant responses, without relying on separate instruments or fragmented datasets.

COMBINED UV AND VIS MEASUREMENT
IN ONE INSTRUMENT

Unlike traditional spectrometers that focus solely on the visible range, the PG400i UV provides true full-spectrum coverage relevant to modern horticulture. By measuring ultraviolet and visible wavelengths simultaneously, the PG400i UV delivers integrated results that reflect real-world lighting conditions.

This combined approach is essential for growers and researchers working with UV-enhanced grow lights, supplemental UV strategies or advanced crop steering
protocols. Instead of isolated UV readings, the PG400i UV presents UV data within the full spectral context, allowing meaningful interpretation and accurate decision making.

PG400i UV - VIS
Full spectrum insight
for advanced horticulture.

SCIENTIFICALLY RELIABLE PRECISION
ACROSS 220 TO 800 NANOMETERS

At the core of the PG400i UV is a high-precision CCD sensor optimized for stability and sensitivity across an extended spectral range. Measuring from deep ultraviolet at 220 nanometers through the full visible spectrum up to 800 nanometers, the sensor delivers reproducible and scientifically reliable data suitable for research, validation and professional horticultural applications.

Automatic shutter control and dark calibration ensure measurement stability across both UV and VIS ranges, eliminating drift and minimizing
environmental influence. This level of control is critical when working with UV radiation, where even small deviations can significantly impact interpretation.

"Measures ultraviolet
and visible wavelengths
simultaneously."

ALMOST IDENTICAL PLATFORM,
FAMILIAR WORKFLOW

The PG400i UV shares the same platform, interface architecture and technical foundation as the PG300i. This means users benefit from the same intuitive operation, detachable remotely controlled sensor head, connectivity options and accessory ecosystem they already trust.

Grower Mode and Scientific Mode are fully supported, ensuring that UV data is presented in a way that matches the user’s level of expertise. Growers receive clear, relevant insights without unnecessary complexity, while researchers gain access to the full scientific depth required for advanced spectral analysis.

By maintaining platform consistency, OBSIDIAN ensures a seamless transition for existing users while expanding capabilities for new applications.

DESIGNED FOR THE GROWING UV MARKET
IN HORTICULTURE

The role of UV light in horticulture is rapidly gaining
attention. UV radiation is increasingly used to influence plant morphology, enhance pigmentation, stimulate secondary metabolites and support crop quality strategies. The PG400i UV is designed specifically for this emerging market, providing professionals with the tools needed to validate, optimize and document UV light strategies with confidence.
Whether applied in controlled research environments,
commercial greenhouses or vertical farming systems, the PG400i UV delivers the insight required to responsibly and effectively implement UV light in modern cultivation.

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

A BREAKTHROUGH IN OPTICAL MEASUREMENT

One of the most defining innovations within the PG400i 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 PG400i 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 PG400i 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 PG400i 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 PG400i 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 PG400i 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.

PRODUCT SPECIFICATIONS ( 220 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 ±8% (Class 1)
  • Wavelength Range 220 nm to 800 nm
  • Wavelengte Accuracy ±0.5 nm
  • Irradiance range 0.1uW/cm2-200mW/cm2
  • Cosine corrector 15mm
  • Stray Light ≤ 0.5%
  • Spectral Bandwidth (FWHM) 2nm
  • Illuminance Range 5 lx – 200 klx
  • CCT Range 1,000 K – 100,000 K
  • X,Y repeatability ±0.0005
  • Chromaticity Coordinate Accuracy ±0.0025.
  • CCT Range ±0.0025.
  • 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

  • PFD UVA (315–400 nm) Photosynthetic Photon Flux Density – UVA Band
  • PFD UVB (280–315 nm) Photosynthetic Photon Flux Density – UVB Band
  • PFD UVC (220–280 nm) Photosynthetic Photon Flux Density – UVC Band
  • UV-PFD 220-400nm Ultraviolet Photon Flux Density
  • PPFD 400–700 nm Photosynthetic Photon Flux Density
  • PFD 220–800 nm Photon Flux Density
  • PFD-B 400–500 nm Blue Photon Flux Density
  • PFD-G 500–600 nm Green Photon Flux Density
  • PFD-R 600–700 nm Red Photon Flux Density
  • PFD-FR 700–780 nm Far-Red Photon Flux Density
  • ePAR 400-750nm Extended Photosynthetically Active Radiation
  • PBAR 350-800nm Photosynthetically Biologically Active Radiation
  • PFD-Y Custom 350-800nm Custom Spectral Photon Flux Density
  • Ech-A (Eₐ,Chl-a) Chlorophyll-a Weighted Irradiance
  • Ech-B (Eₐ,Chl-b) Chlorophyll-b Weighted Irradiance
  • PSS Phytochrome Photostationary State
  • KPPFV (µmol) Kilophoton Photosynthetic Flux Value
  • DLI (mol/m²/day) Daily Light Integral
  • IRR (W/m²) Irradiance
  • LUX – Eᵥ (lx) Illuminance
  • CCT (K) Correlated Color Temperature
  • CRI Color Rendering Index
  • R1–R15 CIE General Color Rendering Indices
  • Fc (fc) Footcandle
  • 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
  • CLI (mol/m²) Cumulative Light Integral
  • SDCM Standard Deviation of Color Matching
  • Purity (pₑ) Excitation Purity
  • FWHM (Δλ₁/₂) Full Width at Half Maximum
  • YPFD Yield Photon Flux Density
  • IRR-C Circadian-weighted irradiance
  • COC (nm) Centroid wavelength
  • CWL Center Wavelength

Ratios

  • B:G Ratio Blue-to-Green Ratio.
  • R:FR ratio Red-to-Far-Red Ratio.
  • R:FR = 1:x Ratio Red-to-Far-Red Ratio expressed as 1:x
  • PAR-B (%) 400–500 nm Blue Percentage of PAR
  • PAR-G (%) 500–600 nm Green Percentage of PAR
  • PAR-R (%) 600–700 nm Red Percentage of PAR
  • PAR-FR (%) 700–800 nm PAR-FR (%) 700–800 nm

Reference Spectra

  • Chlorophyll A Chlorophyll A Absorption Spectrum
  • Chlorophyll B Chlorophyll B Absorption Spectrum
  • Beta-Carotene Beta-Carotene Absorption Spectrum
  • Zeaxanthin Zeaxanthin Absorption Spectrum
  • Anthocyanin Anthocyanin Absorption Spectrum
  • Phytochrome Pr Phytochrome Red Inactive Form
  • Phytochrome Pfr Phytochrome Far-Red Active Form
  • Cryptochrome Cryptochrome Action Spectrum
  • LOV Light Oxygen Voltage
  • Phycoerythrin Phycoerythrin Absorption Spectrum
  • Phycocyanin Phycocyanin Absorption Spectrum
  • Allophycocyanin Allophycocyanin Absorption Spectrum
  • Phytochrome A far red Phytochrome A Far-Red State Spectrum
  • Phytochrome A red Phytochrome A Red State Spectrum

Flicker & Frequencies

  • Flicker Risk - IEEE PAR1789 IEEE 1789 Flicker Risk Assessment
  • Flicker Index Flicker Index
  • Flicker percentage Percent Flicker (Modulation Depth)
  • Frequency (Hz) Flicker Frequency
  • DutyCycle % Duty Cycle
  • Flickercycle (ms) Flicker Period

Color Rendering / Fidelity

  • Rf / Rg (TM-30) IES TM-30 Color Fidelity and Gamut Indices
  • 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

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