White Widow finishing too early...?

I have 6 White widow plants under a 400W metal halide light and they have been flowering for just over a month maybe 5 weeks and they seem to be almost done... most of the leaves are turning yellow and most of the tricombs are cloudy and some have turned amberish...

I belive the growing time is closer to 8 or 9 weeks... should i harvest them soon or should i grow them for the recommended time?

Thanks guys!!!

gonna need to post some pics if youd like help

It may just be running out of nitrogen. I seriously doubt it's done. What do the pistils look like? Theres great threads on here about harvest times.