What is the fine-grained topic of the following text: For basic measurements of photopic parameters and irradiance (excluding flux), a system is typically configured with the AvaSpec-ULS2048CL-EVO spectrometers, a 25 µm FC/PC slit and 300 line/mm grating covering the range from 350-1000 nm and provides 1.4 -2.4 nm full width half maximum (FWHM) resolution. Only return the topic.
Photopic parameters and irradiance measurement system configuration