Not flowering properly

plants are now in 4th week of 12/12 and i know that no other light has been interrupting dark cycle but for some reason they are refusing to bud. they are female clones sativa in coco 50 litre pots run 2 waste system being feed dutch master advance plus potash and a bottle of superbud during week 1 flower sites are present but never had to wait this long 4 buds to form any suggestions ?
 
damn man, 5X600W HPS are alot of bulbs.the problem is deff not the light, but the heat maybe is.when i burn my plant with 38 celsius, it was stop growin too.what's the distance from the bulbs.it must be at least 2 feet i think, if i compare the heat of my tiny 250W HPS :).mine bulb is 1 feet above and still some curling of the toper leafs.
 
well im in the middle of a heat wave at moment but room is water cooled plants look healthy enough and temps are round 35c possibly are late bloomers but like i said i have grown this strain before with no probs but was alot cooler at time fingers crossed they shoot off from now
 
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