About 5 grams.
On another note, I really think you should get more lights. Of course, by "get more lights", I mean throw away the ones you have now and buy an HPS.
Also, your question is impossible to answer, and you have obviously not done any searching throughout this site, or you would know this. You didnt give a strain, you didnt give how wide it is, you didnt say if you FIMed or TOPed the plant, you didnt say what nutrients you used, you didnt say what size pot its in, you didnt say the color of the bulbs, you didnt say when you were going into flowering or if you were in it already, etc. So basically, stop asking questions like this.