I would be interested in hearing why you want LiDAR and why it has to come from a UAV as there may be other technologies that are more effective given your use case. We found that UAV-based LiDAR systems were still large and cumbersome and rather limiting, especially with respect to the area they could cover. A photogrammetric solution allows you to use a lighter weight UAV to capture data for a larger area and process it within a couple of hours. Photogrammetric point clouds are of course not identical to LiDAR point clouds. I wrote up an article on the topic. Many others have also compared the  technologies.