1) Set up your scene and light with Spotlights only if possible
2) On your Spotlight's Attributes, the default is (I'm pretty sure) to already have Depth Map Shadows selected. The first thing you want to do is to turn Auto-Focus off.
3) Change the dropdown menu from Disk Based Dmaps to Overwrite and paste your desire file path into the maps file name.
4) Using Fcheck to view your new depth map (after doing a quick render), zoom in and out of the shown image (or alpha) by adjusting the Focus on your Depth Map Attributes of your Spotlight...you want to frame your entire scene.
5) Once your focus is set, turn Disk Based Depth Maps off.
6) The setting Filter will aid you in blurring the edge of your shadows.
This image using Depth Map shadows took 2 min and 18 seconds to render.
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