can u help pls, not sure what is going on, pics inculded

Hi stoners,
Can any of you help me please, ive been growing for couple of years now and usually get real decent results. I had a major operation 3 months ago and since ive been struggling to get decent yields. I had to change my bulb and ballast, but they were both same as the old one, a 400 hps in a tent, but i cant work out if its too much heat or are they overfed. its really anoying as ive been getting 2-3 ounce a plant now i cant get them to grow to a decent hight. If you could help id be eternally greatfull.




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