I was taught that you usually go by 100watts per square foot (we're talking HID's here.)
A 1kw should cover a 10 x 10 room so it certainly sounds like you have enough wattage to me.

Just guessing.....but it also sounds like you are just cramming too many plants into too small a space so none of them get the space and ventilation they need to thrive.
Weedhound Reviewed by Weedhound on . growrooms x 2 questions? Hi Folks. In a bit of a delema here,Ive just cropped 12 plants wich were from clone and vegged for 3 weeks potted up along the way finishing in 6.5 litre pots. Theses where in a room sized 6foot x 6foot x7foot high so 36 square feet,under 1 600hps and 1 400 hps & I only managed an oz per plant..roughly! Now after some maths I realise where I went wrong yield wise..not enough light covering the floor space :thumbsup: All Ive got are the combined 600hps and 400hps and without Rating: 5