I think you can get within 12 inches of those lights without worry after that it is supercrop time. I am having to supercrop 3 of my plants so far in this grow as they have exceeded 60 inches tall
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Hardest thing for a new grower to do emotionally and physically is to super crop a plant to keep it out of the lights. The problem is many new growers as well as all of us end up in that situation indoors sooner or later. Have some grafting PARA
IN TAPE on hand just in case. 6" lower than you think you should, roll the stem crushing the inside 3 x the diameter of the stem in length between your forefinger and your thumb, then bend the branch over at that pinch. Bend to 90° from the stem or horizontal to the light. If you did not get a good enough interior crush the stem can break usually just on the top. If this happens just wrap with the grafting tape and all will be well. You may need to tie down the bent over top as many branches just lift themselves right back up. A great lesson to teach yourself on your first harvest or any harvest for that matter is to practice super cropping on branches you have harvested. You will get a good feel for what it is to crush and bend without the dread of "Killing a Cola".