Are they screw in spiral CFL bulbs, or U shaped CFL bulbs, and what kind of fixture are they in? It is all about reflectors when it comes to this type of lighting as these bulbs are made for area lighting but you are interested in getting as much light as possible into the tank.
If you have some good reflectors with them, I would call it extremely low light, but probably sufficient to grow some mosses and other very low light plants.
Lighting made for aquariums... it depends. There are some real crap lights out there that are "made for aquariums". If you went with a quality fixture with good reflectors that utilized T5HO bulbs, or went with some CREE LEDs, then yes it would be much better. But it would also change the requirements of your tank. Well-reflected T5HOs put out more PAR (Photosynthetically Active Radiation), especially at depth, which is a measure of how much light is available for your plants to utilize for photosynthesis. The penetrating power of a spiral CFL would be extremely low when compared to a T5HO bulb, even if it was the exact same wattage.
As you add additional PAR to the tank though, you have to take precautions. Plants uptake other nutrients more quickly when there is more available light, and you can quickly bottom out on these nutrients, which then manifests itself as deficiencies of your plant health, and excess algae growth (Algae uses the same nutrients as more complex plants, and can often capitalize on nutrient imbalances better than plants because they are simpler organisms). If you add a bunch of extra light, you have to balance that out with additions of fertilizer and carbon supplementation, either in the form of injected CO2 or glutaraldehyde.
