Is this too many plants for this space

Your light isn't super powerful and autos can flower with 24 hours light... 18 is better... they need a rest.

I don't do autos but it's what I have herd
Okay will the northern still continue to flower though off a 18/6 regiment still?
 
They look healthy but stretched. What's the true watts of the light and what is your tent size? You can lower the lights as long as you stay in the range provided by the light company. Watch for light bleaching if you're running them low.
 
Lights are definitely too high, that is why you have so much space between buds. They are some pretty girls though 8-)
 
1200 watts and it’s like 4 ft by 8 ft
The light is a true 1200 watts at the wall? If so, you should be OK but some LEDs that say "1200 watts" are more like 300 and you will not have a 4x8 canopy of good, hard buds with that much lighting. Weed needs 30-50 true watts per sq ft for good coverage and dense buds.
4x8 examples:
2, 600 or 1000 watts of HID lighting (MH and HPS) Total of 1200 to 2000 watts
2, 480 watt white LED (QB, strips etc.)
CMH is good for your needs too but I don't know much about sizing them.

With proper lighting, you'll need to figure out how to cool the space too.
 
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