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
We've grown a garden for several years, and have experimented with new techniques when we find them. Last year a friend of our showed us his garden, and how he had implemented Vertical Gardening. He sunk some 4x4 posts so they were about 5 feet tall, and used Trellis Netting between the posts. I wanted to try out vertical gardening, but didn't want to spend a Saturday sinking 4 or 6 posts into the ground. Here's how we accomplished it in our garden.