What shall i use to feed my callifornia orange, white ice and purple haze?

Iv just set my light timer to 12/12 after them veggin for 2 1/2 months because i had auto flowering plants at the same time. All my plants i have harvested dont look like the ones you see on tv and everyone elses pictures i dont get nowhere near the yield everybody else does... im using a 400W Metal Halide and i dont have a clue what to feed them. CAN ANYBODY HELP?? :S

more lights

Ive not got money to get more lights the ones i got now cost me £140 and iv only had them about 5 months!!

a 400w should make nice Buds if you keep it close enough, are you using any sort of nutrients at all so far... if you can get a hps bulb and us it, it would help when flowering....

if i keep it too close the tops start to burn and dont grow any bigger iv made that mistake. I have got some organic nutrients which is 6-2-4. My m8 also gave me some stuff for vegging and blowering but that doesnt seem to help ......

Should consider a HPS and use more Potassium and Phosphorous, but keep the Potassium ratio higher then the Phosphorus