Your plants look great.
Willie's DIY QBs would for sure be the most bang for your buck if you're even a little comfortable with electronics. But if money is tight, you could definitely make do with what you have for the time being.
These new lights are amazing but it wasn't long ago when we were all still using inefficient HIDs, T5s, and Blurples and still crushing it. You can increase your yields with techniques, and when you do eventually upgrade lights you'll knock it out of the park.
Love the username, btw. Skål!