LED measurement - Matching accessories for every measurement parameter

Measurement of the various radiometric und photometric quantities of LEDs requires selection of the appropriate accessory. As all our test adapters are CIE 127:2007 compliant, comparability between measurements is guaranteed.

Connection to the spectrometer is made using an optical fiber bundle or a multimode fiber. Accessories can thus be quickly and conveniently swapped simply by disconnecting the fiber, all without losing the calibration of the spectrometer for the respective accessory.

The following table gives an overview of the available accessories:

Optical quantity to be measured





Luminous intensity [cd]

Radiant intensity [W/sr]

LED-4xx Luminous Intensity Adapter
(high throughput; versions available for laboratory and manufacturing)

LED-25  "Averaged LED Intensity" Adapter
(highest accuracy but lower throughput)

Luminous flux [lm]

Total radiant power [W]

Integrating Spheres of the type ISP75 / ISP250 / ISP500 / ISP1000

Illuminance [lux]

Irradiance [W/m²]

EOP-xxx Optical Probe
(see product group "General Accessories")

Luminance [cd/m²]

Radiance [W/sr m²]

TOP200 Telescopic Optical Probe
(see product group "General Accessories")

Angle dependent emission characteristics

LEDGON Goniophotometer

By utilizing a spectrometer, all colorimetric parameters such as dominant wavelength, color coordinates, color temperature and color rendering index can also be determined in addition to the radiometric und photometric quantities.

Matching test sockets for every type of LED packaging

LEDs are manufactured in a variety of packaging designs and configurations - as wired single LEDs, in SMD format or as multi-chip or high power LEDs. Or even as Level 2 printed-circuit-board based products, as is the case for the Luxeon Star. The test sockets needed for mechanically aligning and electrically connecting LEDs are thus equally diverse in order to ensure reliable optical measurements. We provide the broadest range of mounting accessories available anywhere in the industry.




precision test sockets for all standard and high brightness LEDs in both wired and SMD formats


low cost test sockets for specific LED packaging types


test sockets for high power LEDs up to max. 5W thermal dissipation and 2A current; cooling of the LED via heat sink and fan


TEC test adapter for high power LEDs und Level 2 boards up to max. 10W thermal dissipation and 2A current; active cooling and heating of the LED via thermoelectric cooler element

Further Information