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Since hogs don't tolerate heat well at all, they're generally nocturnal during the warm months. A light at a feeder can work pretty well, but a night vision or thermal weapon sight certainly offers more flexibility. Prices range from a bottom of maybe $2K up to $9-10K at the high end for consumer stuff. It's really amazing what you can see with thermal, although it doesn't make hogs magically appear. The first rule of successful hog hunting is that the hogs have to show up.

Here's a video I made of a night stalk earlier this year —