The Hemp Goddess said:You will be amazed at the difference a HPS makes. However, bear in mind that you are still pushing your lumens--you want to try and have 5000 lumens per sq ft., you will have 4166 with your 400W. The walls of your space should be painted flat white or covered with mylar or panda film to make the best use of your light.
You will have more heat in there that you will need to deal with--you have increased your lumens 300% (with only a 25% increase in wattage!). However, it shouldn't be like a sauna .
There is no benefit to lighting the undersides of the leaves.
Hick said:you will not be disappointed easy'...
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