The solar yard lights work great. I have several. The ones on a feeder that I hunted from a few years back were still working when I went to get the feeder going again. I did add a green lens to the light, but they fell off after a few months, the pigs didn't care, they got accustom to the white light right away, they still show up. Heck they even come to the feeder that is near the security lights near my shop.
I started just putting one of the bigger yard lights between the blind and the feeder, about 20-30 feet from the feeder. It covers a much bigger area and shines on the pigs from the same direction that you are looking from. Putting them at the top of a T-post so they would shine down and cover the entire area under the feeder works better.
"Man is still a hunter, still a simple searcher after meat..." Robert C. Ruark