Adding more lidar wavelengths can provide richer details about the environment around the vehicle

https://www.laserfocusworld.com/test-measurement/article/14223715/automotive-lidar-gains-multispectral-capabilities

"we scan a complete frame at one wavelength and switch wavelengths between frames. By combining this data with our specialized simultaneous localization and mapping (SLAM) software, we can build up the multispectral information on a frame-by-frame basis. If we are scanning at a 20 Hz frame rate, we get the traditional 3D data at the full 20 Hz"