About a pound.... anyways no one can give you an idea on yield as too many variables are at play such as genetics, light per square foot, skill/previous grow experience, temperature ranges, veg time... The list could go on. Some strains are known to be better yielders, doesn't mean one is harvesting anything I'd call worth while. I'd personally rather have two ounces of top grade than 6 ounces of mid grade or commercial level. While I've seen some people on here own while growing with cfls, one is unlikely to yield what can be done with hps/mh. You've got some research to do my friend