like i said in the other thread 2300 lumens are in a fluoresent 125w light, you would need 4 of them to equal a 400w hps, 10 x to equal a 1000w. so if you add 4 x 2300= 9200 lumens. zandon says 10,000 or more for a plant so you would have to get another one and that will bring you to 11,500 lumens. before you take anyones advise look at their joined date, that will solve most of your problems, when i ask a question and there are alot of replies iam go with the person who's been here longer OSG (old school grower ). not some one whos been here for a month with almost 1000 post