The UV/VIS/NIR spectrophotometer used by us (PerkinElmer Lambda 950) allows spectral transmittance measurement in the wavelength range of 200 – 2500 nm.
The typical measurements performed by us for building materials are with the wavelength range of 300 nm – 2500 nm (solar spectrum). We’ve supported customers with spectral transmittance measurements in the 200 nm – 300 nm successfully. However, our internal tests showed that it is not possible to perform the measurement in the wavelength range of less than 200 nm. The results are noisy and non-physical.