Here in the states we have cops equipped with infrared say they can map out our house, and if they dont its not worth the paranoia. CFLs are a great alternative and won't spike your light bill. But for a 20 plant operation I really dont know :-/
I like it, but soil is too dirty for an indoor medium. Hydroton, a couple pumps and timers would be more efficient. Regardless, more lights and you are all set up.