Spectral-resolving instruments launched by Jeti Technische Instrumente GmbH precisely measure radiometric, photometric and colorimetric data of light sources, including displays, lamps, illuminaires, LEDs and fluorescent materials. The specbos 1201 measures spectral radiance and irradiance as well as derived values such as luminance, illuminance, color temperature and color rendering index. The specbos 1301 and 1401 perform those measurements plus spectral radiant flux response and intensity as well as the derived photometric and colorimetric data. All operate from 380 to 780 nm with optical resolution of 5 nm FWHM, and they have a wavelength step width of 1 nm. The instruments measure 140 × 58 × 34 mm and are supplied with optics, software and a USB interface.