I planted some this year here in SC for the first time. For me it was okay, the deer did eat it. But, I'm not so certain it was better than oats, wheat, clover etc. Some boys down here like it a lot. For the cost, I think I will just stick with the basics like oats.
According to the Quality Food Plots book, Lupine ranges from 25-30 percent protein and the use of deer can be real heavy to none at all. It also provides good cover for turkeys and quail. Ideal pH range is 6.0 to 6.5. If you don't have a source for the seed then maybe this link will help you.