600 Watt HPS Light Distance?

My 600s are about 12” away. As said, having some air flow under the bulb buys you some extra. Once in a while a branch will grow too close and get burnt. A few crispy white patches on the leaves tell you they're too close.
 
Hello. I bought A temperature Gun with Backlit LCD Display. I'm also A newbi. I'm on My second grow. I try to Keep the temperatue abut 25 degree
Happy growing i
 
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