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In my case I leave the white light out all the time. I don't get out to hunt all that often in that spot, maybe once every month or six weeks. I guess they have time to overcome any learned fear of the light during my absences.
I suspect you're right, that hogs will quickly equate light = noisy death if the lesson is repeated frequently.

Before I lost my lease I had fun calling hogs with an electronic caller during the day. The fact that I got the occasional coyote was bonus.