I’m no pro, but these are great lights for me. I used them to start seedlings this year. They did amazing. Definitely far superior to the bulb that came with the fixture. Last year I brought my plants inside (pot plants) in the fall to try and let them flower longer (like I said, not a pro, started late and tried to prolong my season, not a great idea) and I used two of this companies full spectrum bulbs that were purplish-those two bulbs kept three 4ft plants alive in less than ideal conditions...