These: https://amzn.to/3FoGFQQ which I have mounted in my 20x20 dog pen. They light the whole thing up brightly, and I've tested them after about 11 hours and they were still bright. I also have these on my fence lining my driveway. https://amzn.to/3tskRRQ
I got this recipe from my mom. Mix together: 1 1/2 sticks melted butter 2 1/2 cups graham cracker crumbs 1 1/2 cups confectioner's sugar 1 1/2 cups peanut butter Spread in ungreased 9x13 pan. Press firmly. Melt 12 oz. chocolate chips. Spread over peanut butter mixture. Chill. Cut into squares and serve.