LED / Modules
Comprehensive characterization of LEDs with integrating spheres
Precise radiometric, photometric and colorimetric measurement of LEDs
LED-based light sources have to a large extent superseded conventional light sources, and due to their technical advantages they have given rise to many new applications, e.g. human centric lighting or horticultural lighting. This results in a whole range of new measuring tasks for development and quality control in the LED light lab.
On account of the specific electro-optical properties of LEDs, the semiconductor components must be quality inspected several times during the manufacturing process from the chip to the finished lighting module. For this purpose, an integrating sphere is commonly used in conjunction with a spectroradiometer as measuring equipment. It enables all relevant photometric, radiometric and colorimetric values to be measured, e.g. luminous flux, color temperature, color rendering or luminous intensity.
The challenge: Top quality and flexibility of measuring instruments
Strict requirements apply to the measuring equipment used for LED production control. In the lab – as a preliminary stage to the production process or in quality control – a high degree of flexibility is required in addition to the high quality of the equipment.
Special requirements for LED measurement in the light lab:
- - High precision and accuracy of readings
- - Broad selection of sphere geometry and flexible mechanical interfaces
- - Special measurement adapters for holding LEDs
- - Thermal management for high-power LEDs