OIML G18 Controlled Vocabulary Julia Neumann 2022-12-16 2023-01-02 10:32:57 en-EN spectral width at half maximum value #01860 1. The coherent SI unit is the metre (m), but often the nanometre (nm) is used. 2. The optical quantity can be e.g. radiant luminous flux, absorbance, etc. difference between a higher and lower wavelength value at which the value of an optical quantity is reduced to half of its maximum value between the two wavelengths 2022-12-19 09:13:39