Upgrade from the cfls to a 400 watt hps

IMG062.jpgIMG061.jpgIMG065.jpg Should i lower the light down more? or is that ok? 400 watt hps sun systems 2 I just got this yesterday ,but i just wanna know if i should lower it, The hood is exactly 3 feet 8 inches away from the plants...lower or is this good?
 
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