Flowering issue, yellow leaves and slow bud growth

A question from a fellow grower:

we have taken on a small grow fom seeds and clones. Having an issue during flowering, about 2-3 weeks into cycle the leaves have all turned yellow and bud growth has slow considerable. Any suggestions? The room we us is built and is 7×4×8…using a 1500 watt heater and a 1000 watt high intensity light.and watered lightly about every 2nd day. Attached are some pics any help or suggestions sorry for the crappy quality of the pictures of specimen…I will get a better one before harvest today.

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Strain; Type, Bag seed, or NA

Soil in pots, Hydroponic, or Coco?

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Light system, size?

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