How many plants will a 400w HPS do ?

well for 10 id get a 600watt!a 400watt is good for 6 maybe upto 8 but it all depends on how you wana grow,a 10 plant sog for example would be ok under a 400 watt hps but you might aswell just get a 600watter,that'll be ok for 10, plus more watts=more lumens which usually = bigger yeild.you should try and get one which takes both mh and hps bulbs if you planning on using the light from start to finish.
 
get the 600, its the best bang for your buck as it will give you the most lumen's per watt, and will not cost much more then a 400....
 
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