First Time Grow in 3x3x7 Tent

My current set up is:
Purple Widow strain
3x3x7 Mylar grow tent
400watt MH/HPS air cooled hood (sun leaves 6inch)
440 Hydrofarm Inline fan
Organic Soil
7inch fan in tent
Humidifier (No humidity in the desert.)
Fox farms Nutrients(Have read a few people do not like them much, but they were easy to get for me with out ordering them.)

The tent is located in a bedroom walk in closet. Tent is vented in to the Roof, then outside through a turbine.
I have chosen to use the HPS bulb for the vegging and flowering stages. The oldest plant was started on Feb. 1st, then 3 weeks later the other 2 were planted. The oldest plant is about 18 inches as of the 20th of march. Other two are both 13 inches. All 18/6 and still vegging. I am not sure as to when i should start the flowering stage? It has been 1 month and 3 weeks, 1 month for the other two. They all seem to be thriving and I recently transplanted into bigger pots. I am trying to do it by the "books" but there are so many different opinions. The Temp inside the tent is kept around 77-81 and humidity around 40-50%. I do not currently have a carbon filter although I plan on getting one on pay day. Anything I left out feel free to ask.


















 
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