CIE 250:2022 – New guideline for spectroradiometry

German article by Dr. Tobias Schneider

With the publication of Technical Report CIE 250:2022 Spectroradiometric Measurements of Optical Radiation Sources, the CIE has issued a contemporary document on the fundamentals of spectroradiometry, thereby discharging its predecessor CIE 063:1984 into well-earned retirement after 38 years of effective service.


How to Assess the Eye Safety of VCSELs – Introduction

Article by Dr. Günther Leschhorn, Tianyuan CAO, Dr. Karhik Iyer

In this paper we explain the differences of VCSELs as compared to “normal” collimated, Gaussian lasers, and outline the main steps necessary for VCSEL safety assessment.


Testing adaptive headlights in conformance with standards

Article by Dr. Karin Duhnke

Variable testing of the overall ADB lighting system with the highest precision in a standard-compliant, realistic situation in the field.


Polarization-controlled VCSEL characterization

Article by Frank Münchow and Karthik Iyer

Novel one-shot method enables the full performance efficiency of the VCSELs to be exploited while assuring safe operation.


Live Calibration Yields Lively Colors

Article by Tobias Steinel and Martin Wolf

Novel display technologies, such as near-eye and microLED displays, enable exciting new user experiences. However, they also impose big challenges for quality control, especially with substantial production tolerances and spectral variances of light sources.


Measurement Systems and Calibrations for UV Radiation

Article by Dr. Ðenan KONJHODŽIĆ

The promising germicidal effect of UV-C radiation, also on the coronavirus, raises the question of the reliable measurement of UV radiation. However, this complex task needs expertise and the appropriate equipment.


Efficient testing of advanced headlamps

Article by Oliver Esterl

AMS screen imaging system allows ultra-fast determination of light distributions for HD / ADB / matrix / pixel vehicle headlamps.


Angular resolution in VCSEL radiant intensity distribution measurements

Article by Günther Leschhorn, Thomas Attenberger, and Tobias Schneider

Vertical cavity surface-emitting lasers (VCSEL) are getting more and more popular for 3D sensing and time-of-flight technology in consumer and automotive applications. VCSEL arrays with hundreds of single emitters are often used. Measurement of the radiant intensity distribution is the key to performing a proper eye safety assessment and designing suitable secondary optics for

these emitters.


Eine UV-Anwendung charakterisieren mit kalibrierten Messgeräten

German article by Dr. Ðenan KONJHODŽIĆ

Das UV-Spektrum ist während der Corona-Pandemie in den Fokus gerückt. Bisher existierte kein Referenzstandard für die Strahlungsleistung. Jetzt gibt es einen Kalibrierstandard für UV-LEDs.


Growth in OLED Lighting Demands New Metrological Traceability

Article by Dr. Tobias Schneider

The rapidly emerging dominance of OLED technology for illumination and display applications is driving demand for a metrology tailored to these light sources.


UV LED sources demand calibration to precise measurements for safe operation

Article by Bastian Eder and Denan Konjhodzic

The authors summarize a UV-LED calibration concept that relies upon radiant flux, and emphasize the advantages for developing measurement standards in the increasingly important UV spectral range. The extremely low measurement uncertainties (k=2) of the UV-ACS are comparably low to those in the metrologically unproblematic visible range, thereby offering a reliable resource for radiant flux calibration in the UV-A, UV-B, and UV-C ranges.


Precise light measurement enables decentralized component production

German Article by Dr. Cameron Hughes

To enhance the feeling of well-being of drivers and passengers in a vehicle, interior displays and control elements should be color-coordinated so that all critical information is quickly and easily recognizable. The quality of optical parameters such as color, brightness, mura, and pixel-detection must therefore be tested at manufacturing stage, enabling decentralized component production. This is only realizable with high-precision light measurement technology in the entire supply chain.


Optical In-Line VCSEL Testing

Article by Dr. Martin Finger

In the mass production of laser diodes such as VCSEL, high-resolution array spectroradiometers are an efficient alternative for in-process inspection in a 24/7 production environment. Compared to established measurement techniques, they also guarantee high throughput volumes and reliability in the industrial environment: their configuration means high mechanical stability and enables integration times in the order of just a few milliseconds for CCD and microseconds for CMOS detectors.


Metrological traceability for (O)LEDs

German article by Dr. Tobias Schneider

The transition from incandescent light bulbs to (O)LEDs as dominant lighting sources poses new challenges to light measurement. (O)LEDs exhibit completely different and far greater variations in their spectral distribution, for the measurement of which calibrations with standard illuminant A are not optimal. Metrological traceability is thus particularly important for the interpretation of (O)LED measurements.


Bringing True Colors to MicroLED Displays

Article by Dr. Tobias Steinel and Dr. Martin Wolf

Although microLED displays are a promising technology, they pose new challenges for metrology. Here, two authors from Instrument Systems show how an imaging light measurement device made of a 150-megapixel RGB sensor and a high-end spectroradiometer can provide faster and more accurate microLED measurements.


Design color worlds in the interior

Article by Dr. Cameron Hughes

In order to maximize the feeling of well-being of the driver and passengers of a vehicle, interior displays and control elements should be color-coordinated, so that all important information is quickly and easily recognizable. The quality of optical parameters must be tested at the manufacturing stage, enabling decentralized component production.


How the quality of displays in the vehicle is measured

German article by Dr. Silke Kirchner

Before an LC display is accepted by an OEM, the quality must be carefully tested according to fixed criteria. Besides know-what and know-how, high-precision optical measuring technology is called for here.


Measuring the photometric quantities of an LED

Article by Dr. Günther Leschhorn

The user must familiarize him- or herself with new values and terms, and expects consistency. That in turn is a challenge for lamp and luminaire manufacturers: How are these quantities correctly measured on a comparable basis?


Are screens and lamps on LED basis suddenly dangerous?

Article by Dr. Ðenan Konjhodžić

The current international Standard IEC 62471 contains guidelines for evaluating the photobiological safety of lamps and lamp systems. To ensure reliable evaluation, it places extremely high demands on measuring equipment and procedures.


End-of-line (EOL) Testing of Recent OEM Display Quality Standards

Whitepaper by Instrument Systems

The display market of the automotive industry is developing at rapid rate. Along with fast technological advancement of infotainment systems, head-up displays, or central controllers, a growing demand for safety, aesthetics and user comfort is evolving. In order to economically benefit from the new challenges in the automotive interior sector, it is crucial for suppliers to have a high success rate in meeting OEM display requirements.


In-Line VCSEL Testing

Article by Dr. Tobias Roesener

High-resolution array spectroradiometers guarantee high throughput volumes and reliability in industrial environment.


What you need to know about LED lamps

German article by Ulrike Kuhlman at

Have you ever wanted to buy an LED lamp, but were confused by the data on the packaging? With a few technical explanations you will know what you need to be aware of.


On-the-Fly Light Measurement of Modulated LEDs with DSP 200

Article by Martin Senft

Instrument Systems addresses increasing demands on light measurement technology in the automotive sector: the goniophotometer AMS 5000 combined with the DSP 200 photometer offers a perfect solution for testing modulated LEDs, which today ensure a driving experience under optimum lighting conditions.