I usualy look at wattage. More wattage means more lumens. You should get come CFL that are around 50 watts... I have 4 54 watt CFL and they have been giving me a beautiful grow. How many plants are you growing? When using cfl make sure to keep the lights atleast 2 inches away, not much further away, and not much closer. What you have now will help you, but I'm telling you, you are going to want some CFL that are higher wattage. This is ok for the germination- seedling stages of growing, but to grow healthy babies, get a 50 watt CFL to replace your 30 watt one (or even use both) and just another extra 50watt light to go with the two 40 watt light. Believe me, the more light, the better grow you will have!