HELP PLZ im cant growautoflwoering weed

im growing fast bud witch is a AF strain they r a week and a half old and have 4 leaves each but they r lieing down like the stems r not strong enough.I started them on nuts about 4 days ago a still no sign of emprovment im using a 600w HPS witch is about 4 foot away from them.Im growing in a 1.2m by 1.2m cupboard with white walls.this is my third time at tryin to grow weed my first twice i used reg seed. Any help from any 1 would be great TY for ur time.I really need to get smoke from this batch as i cant afford to get any more seeds.i will try and post pics tomorrow as this is not my computer and i dont want the owner knowing i have weed plants

that space don't seem like much considering you have a 600 watt bulb,is it hot in there,unless you have proper ventilation,it has to be really hot in there,post any pics?

im guessing your plants are super stretchy because the light is so far away. i dont know much about hps, but id say they shough be atleast 16-18 in away from the canopy. also, having a fan blowing them around ((a gentle breeze not a harsh wind) will strengthin your stem