dude - im not sure whats up with some of this feedback - the yellow/crispy leaves are looking like a sure sign of phosphorous deficiency, possibly under feeding, your lights are fine as far as heat / light stress goes. you dont have enough wattage [ a good rule is to put your hand the same distance away from the light as your plants are, and if your hand is too hot for comfort, then you need to move it further from your plants]
Those buckets are causing the majority of the problem i think. they are too small > your plants are trying to expand their roots, and cant. This is telling the plant that it needs to downsize, and that there isnt enough room for more growth. So it starts eating itself, essentially.
It looks like you have a 1.5 gal and a 2.5 Gal pot(s). Too small. Go to Home De-pot, buy some 5 gal buckets, and drill holes (like 5-6 for drainage) in
the SIDES (important)> RIGHT next to the bottom, those will be good the entire grow -until you finish flowering.
What are you feeding them? what kind of soil are you using if you haven't fed them yet or don't plan on feeding them... ? your plants are pretty big, so you've done good to get them this far, dont give up.
it could be a phosphorous def > but I KNOW you need bigger buckets. my plants looked very very similar to yours, then I popped them into some 5 gals and they took off over night. literally within 48 hrs they had grown 4-5 inches and got their pretty coloring back.
o and Terry Codone is right, if you can afford it, try to double or triple the amount of light you have on them [ 4 - 125w CFL's would be ideal] If you cant afford them then no biggy, but I would aim for at least one more 125watter. are you flowering them right now? if you are you need to transplant immediately. if you arent, then id put some 5500k - 6500k cool blue CFLS in there instead of the warm reds, and still tranny immediately.
pm me if you need any more help dude, sometimes people just have no clue, even though they are trying to help/(receive rep for nothing), so be careful with that.