Gigahertz optik, founded in 1986, gigahertz optik GmbH produces a variety of handheld and desktop measuring instruments for accurate optical radiation measurement. Photodiode detectors with photometer, colorimetry and radiation measurement (UV to NIR) response can be configured with any of our photometer to adapt to a variety of measurement tasks. Gigahertz optik produces compact and cost-effective spectrometers for traditional and LED lighting. Gigahertz optik's mobile instrument for measuring photosynthetically effective par irradiance has the following features: mobile instrument, data recorder, splash proof, measuring par, user's photochemical spectrum, additional measurement and photos. And Scot. Illuminance, spectral irradiance, related color temperature, color rendering index.