UPRTek MK350N Premium Handheld Spectroradiometer

Overview

The UPRTek MK350N Premium Handheld Spectroradiometer is a field-deployable, high-fidelity optical measurement instrument engineered for precision spectral radiometric and photometric analysis of visible light sources (380–780 nm). Based on CMOS linear array sensor technology with 1 nm spectral resolution and ~12 nm FWHM bandwidth, it implements calibrated diffraction grating spectrometry to deliver traceable, repeatable measurements of spectral power distribution (SPD), illuminance (lux), correlated color temperature (CCT), chromaticity coordinates (CIE 1931 x,y and CIE 1976 u′,v′), color rendering indices (CRI Ra, R1–R15), Color Quality Scale (CQS), Television Lighting Consistency Index (TLCI), and the IES TM-30-15 metrics (Rf, Rg, and color vector graphics). Designed specifically for LED lighting R&D, manufacturing QA/QC, and lighting design validation, the device complies with core photometric measurement principles defined in CIE Publication 127, IES LM-79, and ISO/CIE 13370. Its architecture supports both laboratory-grade accuracy and rugged portability—enabling in-situ verification under real-world operating conditions without requiring optical integration spheres or benchtop setups.

Key Features

• High-resolution spectral acquisition: 380–780 nm range, 1 nm data interval, ±1 nm wavelength repeatability (under stable illumination)
• Extended illuminance range: 5–100,000 lx with ±2.5% accuracy (calibrated against Standard Illuminant A at 20,000 lx, 23±2°C, RH ≤50%)
• Chromaticity precision: ±0.002 x,y (100–100,000 lx); chromaticity repeatability down to ±0.0002 x,y (500–100,000 lx)
• Dedicated flicker analysis mode compliant with IES RP-27, ASSIST, and ENERGY STAR SSL V2.1 requirements; 100 kS/s sampling rate, 5–50 kHz frequency range, ±5% flicker index/percent flicker accuracy
• Comprehensive color quality evaluation: Supports CRI, CQS, TLCI, and full TM-30-15 implementation including Rf (fidelity), Rg (gamut), and vector graphic visualization
• Intuitive 3.5″ resistive touchscreen interface with nine operational modes: Basic, Spectrum, CRI, CIE 1931/1976, TM-30-15, Flicker, Time-Frequency Domain, File Browser, and Comparison
• Multi-connectivity architecture: SD card (up to 32 GB), Mini USB 2.0 (MSC mode), and optional Wing Wi-Fi module for iOS/Android remote control and real-time data streaming
• On-device storage: ~68,000 measurement records (Excel + JPG) on included 8 GB microSD card; 5-hour battery life (2500 mAh Li-ion)

Sample Compatibility & Compliance

The MK350N Premium is optimized for direct-field measurement of steady-state and modulated visible-light emitters—including LED lamps, OLED panels, fluorescent tubes, HID sources, and architectural luminaires—without auxiliary optics. Its cosine-corrected input optic ensures compliance with CIE S 023/E:2013 angular response requirements. All photometric and colorimetric calibrations are traceable to NIST-traceable standards via UPRTek’s ISO/IEC 17025-accredited calibration laboratory. The instrument meets electromagnetic compatibility (EMC) requirements per EN 61326-1 and safety standards per EN 61010-1. Data integrity protocols align with GLP/GMP documentation expectations, supporting audit-ready export of raw SPD, metadata, and measurement logs in CSV, Excel, and JPEG formats. Firmware and PC software (uSpectrum, uFlicker) support 21 CFR Part 11-compliant user authentication, electronic signatures, and audit trail generation when deployed in regulated environments.

Software & Data Management

The MK350N Premium integrates with three dedicated software platforms: uSpectrum PC Software (for spectral analysis, comparative reporting, and batch processing), uFlicker PC Software (for time-domain flicker waveform reconstruction, SVM calculation, and compliance reporting), and the uSpectrum mobile app (iOS/Android) enabling wireless device control, live spectrum preview, and cloud-synced project management. All software packages support multilingual UI (English, Traditional/Simplified Chinese, Japanese, Spanish, German, French, Italian, Russian), customizable report templates, and export to industry-standard formats (CSV, XLSX, PDF, JPG). Raw spectral data is stored in open-format ASCII files containing wavelength-intensity pairs, enabling third-party analysis in MATLAB, Python (NumPy/SciPy), or R. Firmware updates are delivered via secure HTTPS download and validated through digital signature verification.

Applications

• LED product development and binning verification in manufacturing facilities
• In-line QC testing of luminaires during final assembly and aging cycles
• Lighting design validation for architectural, retail, healthcare, and educational spaces
• Flicker hazard assessment per IEEE 1789-2015 and IEC TR 61547-1 for occupational health and safety compliance
• Academic research in photobiology, circadian lighting, and human-centric lighting (HCL)
• Regulatory submission support for ENERGY STAR, DesignLights Consortium (DLC), and CE marking
• Field service diagnostics for roadway, tunnel, and marine lighting installations
• Comparative spectral analysis across lighting technologies (e.g., phosphor-converted vs. RGB LED systems)

FAQ

What spectral calibration standards does the MK350N Premium use?
The device is factory-calibrated using NIST-traceable tungsten-halogen and LED reference sources across its full 380–780 nm range, with calibration certificates issued per ISO/IEC 17025 requirements.
Is the instrument suitable for measuring pulsed or PWM-driven LEDs?
Yes—the 100 kS/s sampling rate and real-time flicker analysis mode enable accurate capture of fast transient behavior, including duty-cycle-dependent CCT shifts and harmonic content up to 50 kHz.
Can TM-30-15 metrics be exported for regulatory documentation?
Yes—Rf, Rg, gamut area, fidelity index maps, and color vector graphics are exportable as standalone PDF reports or embedded in Excel workbooks with full metadata.
Does the device support dark current compensation and stray light correction?
Yes—automatic dark measurement is performed before each spectral acquisition; stray light rejection is specified at ≤−25 dB (550 nm ±40 nm band), verified per CIE 13.3-1995 methodology.
How is measurement uncertainty quantified for photometric parameters?
Uncertainty budgets are provided in the calibration certificate and include contributions from sensor nonlinearity, temperature drift (±0.02%/°C), cosine error, and spectral mismatch—fully compliant with GUM (JCGM 100:2008) guidelines.