Yes it is possible... but impractical. You might as well go buy 2-3 g's as spend 6 or 7 weeks growing a plant that will give you 2-3 g's

I have done it outdoors by germinating seed once we get to 13 hours daylight, so that 2-3 g's estimate is with full sun in the Australian summer.

I'd hazard a guess and say he is dreaming if he thinks he will achieve 3-4 g's off a low watt cfl, from a single plant without a veg period.

But I wouldn't discourage him from trying though, personal experience is the best teacher. He will soon work out what does and doesn't work. :hippy:

edit ~ excellent link Granny :thumbsup: