Lighting HPS

[ap77]

So would HPS 400watt be enough for two plants? How much does it cost a month for the 400watts HPS bulb?

 

[kingjetorl]

More then enough! Not sure about price.

 

[Torched]

You can easily do 4 good sized plants or 6 small ones. Effective coverage is about 3x3ft. Cost depends on how much your electricity costs and how many hours a day it's on.