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Gigahertz Optik GmbH (Headquarter)
Phone: +49 (0)8193-93700-0

Gigahertz-Optik, Inc. (US office)
Phone: +1-978-462-1818


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Light Meters, Detectors, UV-VIS-NIR Radiometers

Devices and systems for photometric, radiometric and colorimetric measurements of light and optical radiation. Light Meters and Radiometers for different applications like UV radiation, Laser measurements, LED measurements, photomedicine and much more.

We offer one of the most comprehensive photometer (light meter) and radiometer product ranges including light measurement detectors in the industry. Coupled with our versatile and high class optometers (respectively current amplifiers and display units) we are able to support you for your measurement requirements. Whether the radiometers or light meters task is: laser pulse measurement, low signal illuminance detection, photomedicine, UVC disinfection, radiation curing, PAR, infrared detection, etc. We usually have a suitable light meter solution ready!

In the following categories you will find exemplary application solutions and combinations of our products to ready to use radiometers or light meters. If you do not find what you are looking for, please contact us for individual radiometer respectively light meter advice. We are happy to support you! Especially because of the multitude of possibilities for radiometers or light meters and the different optical characteristics of the detectors with different focus (highest sensitivity, most optimal cosine response, different calibration strategies, etc.) a consultation can lead to the optimal radiometer and light meter solution.

Due to the modular detector concept, partly with stored calibration data in the detector head for plug & play application, it is also possible to equip one Optometer/Display Meter with different detectors to enable several applications with one radiometer at a reasonable price.

At the same time, we do not compromise on precision. Our measurement systems allow highest radiometric measurement accuracy by very low dark currents, automatic offset corrections and more than 30 years of experience in the analog amplifier field. Especially these are very challenging due to the measurement of a few pA (picoampere). Our experience also shows in the optimally adapted detectors (responsivity curves), cos responses, linearity as well as calibration strategies and provided rel. spectral responsivities of the detectors for further corrections. 


A detector head comprises one or more photodiodes each with an appropriate optical bandpass filter, diffuser, lens assembly, integrating sphere or other optical elements. Detector heads are calibrated in the Gigahertz Optik GmbH's calibration laboratory.

Optometers, Amplifiers, Display Meters

Optometers are a specific type of digital multimeter (DMM) used for optical radiation measurements. The particular light detector(s) connected determine the wavelength range/spectral weighting function and displayed measurement units.

UVC Radiometers

UV-C radiometers / UVC light meters for measuring the irradiance (µW/cm²) and dose (mJ/cm²) of germicidal lamps including Hg, excimer and xenon lamps as well as UV-C LEDs. Compact, laboratory grade UVC meters for use in the field, product development and research. UVC Meter Product Selection Guide below:

Meters for UV-VIS-NIR Radiometry

Radiometers for the measurement of UV-visible-NIR irradiance (W/m²) and radiant flux (W).

Light Meters for Photometry

Comprehensive range of solutions for the measurement of illuminance (lux), luminance (cd/m²), luminous flux (lumens) and luminous intensity (cd).

Radiometers for Laser Radiation

Laser Power Meters, Radiometers, Dosimeters and Data Loggers for Irradiance, Laser Power, Laser Energy and Pulse Shape in the 400 nm - 1800 nm Wavelength Range.

Light Meters for LEDs

Photometers for the measurement of visible LEDs and radiometers for UV , visible and NIR LEDs.

UV Curing Meters

UV curing meters and spectroradiometers for UV curing intensity and dose measurements. A critical quality feature of UV curing processes and systems is the control of the UV dose within the wavelength range required of the particular photoinitiators with UV curing radiometers.

UV Meters

A comprehensive range of UV light meters with optimized solutions for almost every UV application. The following product table lists UV radiometers for measuring UV-A, UV-B and UV-C irradiance (W/m²). In addition to our versatile UVC radiometers, the innovative MDC4 LED UV meter series with centroid wavelength determination offers unique capabilities.

Light Hazard Meters

Light meters to determine the UV radiation (skin and eye), blue light (eye) and infrared (skin) hazards in accordance with international standard.

Photomedicine Light Meters

Light meters for the measurement of optical radiation in therapeutic, diagnostic, ophthalmological, and endoscopic applications.

Light Meters for Horticulture (PAR, UV and NIR)

Light meters for measuring horticultural lighting in terms of PAR, UV and NIR irradiance.