Photometers and colorimeters – Platform for precise and fast light measurement

A photometer is used to measure the photometric quantities of illuminance (lx), luminous intensity (cd), luminous flux (lm), and luminance (cd/m²).

The integral method and the fast response time of silicon photodiodes means that photometers can achieve an outstanding measuring speed. They are therefore ideal for performing fast goniophotometric measurements. We take great care in the development and production of photometer heads and use innovative amplifier technologies. These comply with the most stringent requirements in conformity with standards defined by DIN EN 13032-1, DIN 5032-7, CIE 69 and CIE 121.

The Optronik Line tristimulus colorimeters are based on 4 silicon photodiodes, i.e. one detector each for Y and Z and 2 detectors for Xblue and Xred. This technique achieves a more precise filter correction to the tristimulus functions. The CIE color coordinates xyz and the correlated color temperature are then calculated from the XYZ values.

Overview of available photometers and colorimeters

Digilux 9500 Illuminance meter Universal and competitively priced laboratory instrument Photometer heads for different applications; optional thermostatic stabilization and cosine correction; classification in conformity with DIN 5032-7 and CIE 69
DSP 10 Illuminance meter Ultra-fast goniophotometric measurements Digital signal processor for optimum filtering of PWM signals
DSP 200Illuminance meterUltra-fast goniophotometric laboratory measurementsExcellent stability and lowest noise through detector cooling. Maximum accuracy in conformity with DIN 5032-7 and DIN EN 13032-1
CM 10 Tristimulus colorimeter Goniophotometric color measurement Precise determination of color coordinates and color temperature
LM 20 Luminance meter Laboratory measurements of automotive license plates Special photometer, adapted to type testing for goniometric measurements of license plates

Instrument Systems also supplies custom solutions based on multi-channel photocurrent amplifiers with up to 75 detectors and photometers for outdoor measurements. The applications range from automated lighting control to measurement of luminance in the night sky.


The Optronik Line photometers and tristimulus colorimeters are based on detector heads that very precisely match the spectral sensitivity function of the human eye by means of optical full-glass filters. Photometers measure the V(λ) function whereas tristimulus colorimeters measure all 3 tristimulus functions (XYZ). Full filtering means that virtually no errors result from non-uniform illumination.