How far to keep HPS light from plants

This is after I moved it up I set mine about 6" above tops and move when top leaf lip corners have crispy ends. Mine also stays cool enough to touch right at bulb I've bleached the top of 1 bud with this method but makes sure a
 

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hps-dist-chart-jpg.3122889
I wonder if the numbers for metal halide are similar
 
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