More light is always better, but to answer your question, need a little more info. How old are they? What spectrum cfl?(should be red). If the temp of the bulb isn't that high, it can be pretty close. Hang your thermometer right at canopy level and move the light down until it's the highest comfortable temperature they like. Cfl's aren't gonna give you the fattest or densest nugs, but you more than doubled your light output, so only good things can happen.