Duggy, looks like nitrogen deficiency, all leaves are yellow, what are your NPK ratio's in the veg feed dug ? are you feeding quarter strength nute dug ? morning and evening feeds ??...If not N def, then PH must be off Dug, 6.5ph your nute after adding to water etc.......would you be changing up the light to a 400w ? 600w...mixed spectrum HPS ?...........it may solve your low temp in cab etc, with winter coming etc, temp will only drop from here in Duggy. I find, with a small bathroom 100mm extractor and duct, pumping the hot air from top of cab to floor level helps homogenize cab temp, it works for me,..........AB.......