650 watt mh growing purple. help.

So i just recently got a bigger grow space but its still a little tight but its enough. So i got 650 w mh light with hood and two way ballast all for a hundred. i hAVE there plants growing cfl tight now adn moving all the plants over to the mh. so How far should the 650 watt light an hood be to the plants. with out burning them . any suggestions or tips for my new grow . i have a romulan plant. 1 GDP plant, and 1 purple Kush . they were poted in soil a little over a week ago as clones,,,, any advice and should i be using hps or is mh ok,, TIPS,,, help please i want top notch fire weed
 
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