Overview
Absolute measurement units are essential for accurate LED testing in industries where consistent, traceable results are a quality requirement. Traditional spectrometers often fall short — laboratory-only designs, complex operation, and calibration using a single bulb source that doesn't represent real LED behaviour. The Feasa LED Spectrometer was designed to address exactly these limitations.
The Feasa LED Spectrometer S2 delivers traceable measurements in a practical, compact and robust format ideal for desktop and production use. Crucially, Feasa's manufacturing calibration process uses a range of LEDs — not just a single bulb — making it far better suited to real-world LED measurement than traditional instruments. With a spectral range of 380–780nm, 0.1nm wavelength resolution and integration times from 10µs to 4 seconds, it handles everything from rapid production screening to detailed laboratory characterisation.
The Spectrometer is specifically designed for testing LEDs on populated PCBs where access is limited. On-board firmware calculates colour automatically in multiple colour spaces, using the same simple command structure as the Feasa LED Analyser. Values transfer directly to Feasa LED Analysers to validate production calibration. Three adapter families extend its capability — Miniature Integrating Spheres (Luminous Flux in Lumens), Luminous Intensity Heads (Candela) and Luminance Heads (cd/m², for automotive displays) — all using FP02 armoured patch cords. Multiple Spectrometers can be Daisy Chained, with PWM capture, sequence capture (up to 450 measurements) and external trigger input supported.
The reference standard. Trusted globally.
Absolute, traceable measurements
Measures in real physical units — Lumens, Candela, cd/m², Watts — calibrated relative to a traceable standard. ±0.005 CIE xy chromaticity accuracy. Calibrated using a range of LEDs, not just a bulb, ensuring the calibration reflects real-world LED behaviour.
380–780nm full visible spectrum
Full spectral range from UV-edge to near-IR with 0.1nm minimum wavelength step. Integration time 10µs to 4 seconds with automatic exposure control and range selection built-in. Ideal for RGB LEDs, colour mixing and white LED characterisation.
Compatible with all Feasa LED Analysers
Transfer measurements directly to any Feasa LED Analyser to create golden reference boards and calibrate production setups. Uses the same command structure as the Feasa LED Analyser, minimising integration effort. Daisy Chain for multiple units from a single port.
40+ years expertise
Engineering LED test solutions since the early 2000s, headquartered in Limerick, Ireland.
Millions of LEDs daily
Tested every day worldwide via Feasa systems across automotive, medical and electronics production lines.
ISO 9001 certified
Full in-house design, development and manufacturing. Deployed in 30+ countries worldwide.
Applications
Where our LED Spectrometer is commonly used.
Production Calibration
Golden Reference Board Generation
RGB LEDs
RGB LED Calibration
Laboratory
LED Characterisation and Binning
Production
Production Line Verification
Technical Specifications
| Paramètre | Valeur | Remarques |
|---|---|---|
| Spectral range | 380–780 nm | Full visible spectrum |
| Min wavelength step | 0.1 nm | High resolution |
| Integration time | 10 µs to 4 s | Automatic exposure control |
| CIE xy chromaticity accuracy | ±0.005 | After calibration with integrating sphere |
| Power accuracy (Watts) | 10% | After calibration |
| Luminous Flux accuracy | 10% | After calibration |
| Peak wavelength accuracy | ±1 nm | |
| Wavelength repeatability | ±0.5 nm | Excellent consistency |
| Chromaticity xy repeatability | ±0.0005 | Precision measurement |
| Intensity repeatability | < 1% | |
| Interface | USB 2.0, RS232, Daisy Chain, Ext. Trigger | Flexible connectivity |
| Supply current (USB) | 180 mA | USB bus powered |
| Dimensions | 125 × 54 × 32 mm | Including brackets |
| Fiber diameter | 5.1 mm incl. cladding | Armoured fibre |
| Operating temperature | 0–40°C | Narrower than most Feasa analysers |
| Special functions | PWM, Sequence Capture (450), Ext. Trigger | |
| Integrating Sphere adapters | SP13, SP23, SP16, SP26 | Luminous Flux (Lumens) |
| Luminous Intensity adapters | CD02, CD04, CD08 | Candela — CIE Condition B |
| Luminance adapters | LU01, LU02, LU04, LU07 | cd/m² — automotive displays |
| Adapter patch cord | FP02 (600mm, FC-PC to SMA) | Used by all adapters |
| Compliance | CE, RoHS | EU standards |
| Model number | Feasa S2 |
Feasa Spectrometer Software Suite
Included — Windows 11 / 10 / 8 / 7 / Vista / XP
- Graphical Display Program — Real-time full spectrum display and CIE xy chromaticity diagram
- Datalogging and compare — Log measurements over time, compare against stored references
- Terminal & Scripting Program — Command-line control with CSV export
- Feasa Spectrometer Software — Calibration workflow, golden board generation, Analyser value transfer
- Test Software and User Cal — Also included with every unit
- DLL/SDK — Programming examples in LabVIEW, C++, Python
Downloads and Resources
Spectrometer Datasheet
Adapter Datasheets