Lumen is a decent light. The new Lumen I've read are comparable to the CXB3590s. I'm running the CXB3590s and they're great lights. I've had very fast veg growth from them. Running 3x 100w CXB3590 in a 2x4 right now over four plants (will be three). This is my first time using for flower and just flipped today, so I can't personally attest to their flower power but I've heard they work great in this cycle as well. If you still haven't upgraded Quantum is probably your best bet but take a look at the Black Sun fixtures by ShenZhen (Panda/CF Grow) before buying anything. They are using Vero29 or Lumen. They're extremely cheap if ordered direct and so are the CXB3590 fixtures.