my experiences are pretty much the same. i had 3 separate flower chambers: #1 400hps, #2 150hps, #3 approx 350watts of cfls. i flowered clones from the same mother in all 3 regularly. i thought i noticed a slight difference for a bit but i think it was just in my head. as kp said yeild and density are definitely affected. i did notice that cfl's seem to produce more trichs. for that reason i added 4 42 watt cfls to the 400hps and 4 too the 150 hps flower chambers. strain and the experience of the grower have the greatest effect on potency imo.