u can flower with cfls man that 150 watt system isnt verry good i have seen it u can spend 40 more dollers and get a 250watt cooltube kit. i personaly would just flower useing cfls thats what i did on my very first grow and the buds actuly got huge almost as large as they get under my 1k hps as long as u have enough cfls u will be good
if ur gonna use a hps then just use them 4foot shop lights from walmart the same thing as thoughs t5 fixtures just way cheaper
thats what i use for veg and i flower under 1000 watt air cooled high pressure sodium.