shorter r&d cycles, eulumdat & ies in view - opsira for general lighting

Luminous intensity distribution, luminous flux efficiency, energy efficiency class, or color temperature (keyword dynamic white) are central aspects for the accurate use of LEDs. Also, the lamp market is extremely fast-paced, with an immense variety of products. In this environment, opsira accompanies its customers as a flexible and competent partner. This means:

  • From the product draft to serial production: opsira development support is there to assist you throughout the entire process – and also on the topic of redesigning with new LEDs.

  • Realistic optical simulation and optimization: opsira lightlab provides high-quality ray data and measures scattering properties (BSDF), transmission and reflection of the materials used.

  • Comprehensive portfolio: The opsira spectroradiometers, the goniophotometer robogonio, and opsira's integrating spheres provide standard-compliant measurement data.

Optical Engineering. Light Lab. Test Systems. opsira is your full-service provider

Optics Design

Development of optical systems from the concept over the development, the production, and test of prototypes to series production.

Light Lab

Fast and precise light measurements of your light sources, LEDs and material samples carried out in the opsira lightlabs.

Optical Measurement Systems

Custom-made measuring systems for field work. The goniophotometer robogonio for example combines near-field, extremely fast far-field, and spectral measurement in one single, highly flexible system.

Test and Control Systems

The opsira eol (end-of-line) systems enable both the control of your production process and the quality of your products while they are manufactured, robot based if required.

diffusil® Diffusers

diffusil diffusers are made of a special opaque synthetic fused silica glass (99,999% SiO2). They are designed to create an almost perfect lambertian light output over a wide wavelength range in transmission and reflection.

Do you have any questions?

Please contact
General Manager
Jürgen P. Weißhaar:
Phone +49 751 561890


Which industries are supported by opsira in the field of optical systems engineering?

opsira supports its customers in optical systems engineering primarily in the general lighting, automotive, medical technology and signal lighting sectors.

Furthermore, opsira takes care of all systems engineering issues of lighting, no matter in which industry. This includes, for example, luminous intensity distributions, luminous flux efficiency, energy efficiency class or color temperature, EULUMDAT, IES and much more.

What is luminous intensity distribution?

The luminous intensity distribution describes the emission of a light source or luminaire in all directions. The LID indicates the respective luminous intensity in candela (cd) or candela/lumen (cd/lm) for each direction.

What is luminous flux efficiency?

The luminous flux efficiency or the efficiency of a light source indicates the ratio between the electrical input (in watt) and the luminous flux emitted (in lumen). The unit of luminous flux efficiency is lumen per watt (lm/W).

Incandescent lamps commonly used in the past are in the range of 10 -18 lm/W. Modern LED systems are in the range of more than 200 lm/W.



EULUMDAT is a data format (*.ldt) for the exchange of photometric data. The abbreviation EULUMDAT means "European Lumen Data Format" and has become the common industry standard in large parts of Europe. Nevertheless, the differentiation EULUMDAT is necessary because other countries and regions use other standards for photometric data (e.g. USA and Great Britain).

What does IES mean in optical measurement technology?

IES is an abbreviation for the Illuminating Engineering Society (see also IES also describes a file format that contains standardised photometric data. This data format was developed by the Illuminating Engineering Society and therefore has the abbreviation IES as its file extension (*.ies).