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what distance should my fixture be from my tops of plants?

I have a 250 or 400 watt mh or hps fixture so i can use any combination of those things. Currently i have a 400 w hps bulb in, and im just wondering if anybody could reccomend a good distance. Im just playing with it having different distances at the time being. Thanks!
 
Hold your hand above your plants and make sure you dont feel the heat from the lamp. Obviously the closer the better. Thats all i do with my 400 watt hps.
 
Jamison said:
Hold your hand above your plants and make sure you dont feel the heat from the lamp. Obviously the closer the better. Thats all i do with my 400 watt hps.


Thank you! Would you know why certian leafs have small yellow spots? Nothing i see online is similar
 
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