Help please growing newbie

hi guys im a newbie to this site..just learning my way around...however i have a couple questions hopefully one of the pros can help me out!..

my room is 21 feet long 8 feet wide

my setup is going to go a little somthing like this... 14 lights total...7 lights on each side of the wall with umbrella shades jus plain or regular umbrella shades.. my question is can I place a shade ever 3 feet so i can get 7 lights a side... they are going to be 600 watt hps...
 
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