1.Measuring photoelectricity parameter changes curves when lights on. 2.Test speed is 20s 3.Its own software can link with P Measure and display the relative spectral power distribution (UV-VIS-NIR)P(λ), chromaticity coordinate, correlated color temperature, rending index, color difference, red ratio, blue ratio, green ratio, spectrum radiotion power, peak wavelength, luminous flux, luminous flux ...