what did i do wrong

ok i have 5 plants that are around 4 months old and have been budding for atleast 2 months....starting these plants was easy ....i used foxfarm organic soil with adv nutrients organic iguana juice under a 400 watt conv light......everything went well during veg and most of budding untill i noticed that around 2 months into budding my plants started to show less signs of growing nice fat buds instead i got really light fluffy weed that just doesnt seem to wanna finish up and fill out....... what can i do if anything to get my buds to thicken up and finish out

you might want to check out videoman40's post on adding molasses. might help. 400 watt hid should be big enough for 5 plants. VV

what strain and do you have any light leaks?

did you use hid or conventional lights? I see you posted conventional as in no ballast house bulbs.If so thats your problem as those dont put enough usable light off and are real hot.Also did you have lights close and good air movement.Temps no hotter then 80 max?