Update.. I got a bunch of new fish so I've upped the feeding which in return is creating more growth.. So that's made it a little easier to tell.. I've come to the conclusion that the Cree LED bulb is getting a pretty significant growth over the CFL. So I went on Geek (wish.com) and picked up a couple of these Bridgelux LED grow bulbs ($4 each) and swapped out the CFLs.. I'll let you all know if they do better..