That light is to small and I like using an external ballast for less heat in the grow space.
The 600w would be even better for another 30 bucks!
The 600 would be the bomb. You would get more than enough lumens. The 400 would be just enough,
I did it :farm: I bought the 600 watt system and an inline fan with a 20" filter combo. Man i'm think i'm on the right track thanks to everyone help. :yay::yay::yay:
Congrats on purchase. You are well on your way to a most addictive hobby. Its important to remember that with ventilation, you are serving 2 purposes. One is the removal of heated air so that you can maintain a constant 75-80f temp within the space. The other is to remove the CO2 depleted air and pull in fresh air for the plants to breathe. So where ever you are planning to set up your grow space, you need to think about how to completely remove the heated air, and where to pull in fresh "outside" air. It will not work well to set it within a room of the house and circulate the air within the room and the tent, as the larger body of air would quickly get just as heated and depleted over a longer period of time.
If the person has a large house that is occupied by people and animals, then the possibility of circulating the tent's air throughout the house is viable but would require connecting into the house ventilation system.
If you will be keeping your grow tent in an external building, then I would suggest circulating the tent air out of the tent and building to the outside, and then allow fresh air to be drawn into the building through passive ventilation and have its temps modified before it gets drawn into the tent through its passive intakes. This method will require you to have a source of heat/AC to modify the constantly incoming outside air to maintain the comfortable temps in the tent.
You are going to LOVE it! Going with the 600W over the 400W was a wise decision, IMO. One of the neat things about that light is that you can dim it if you need to, but it will also be good for a bit more light should you decided down the road you want a bigger space. T5s for vegging and HPS for flowering is my choice for lighting.
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