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Is 50w HPS enought to flower a white widow in a 1'x1' box?

This is my setup that I am planning on making over the weekend. It will be a drip system. The plywood will be covered in mylar before placing the pots. I will drill a few holes in the side of the pots for oxygen. The 8'' Pots will be filled with hydroton and a 3.5'' rockwool cube...

For 10 White Widows being grown to about 3 1/2' tall in a grow box 6ftwide, 3 ft deep, 4ft tall?

Smoking?

I found this 400w HPS lamp brand named "Agrostar". It comes with no warranty and no bulb but is brand new for 70 bucks. Anyone know if this is a deal or a piece of ****?

Do Co2 systems really help yield if your area is already ventilated? I read that you could expect anywhere from 20% - 100% increase in yield. Can anyone confirm this? It seems like a big range. Also with a kit from HTG would I need to monitor the Co2 level myself? or will the system...