Heres a tip. Put youre hand under the light (Ov) Dont touch but keep the light as close as you can however if its too hot for youre hand its too hot for youre plants. Im using a 400 watt Hps, Mh Ballast so i can veg with a MH then Switch to Hps without changing the Ballast. Ive got a 600watt Hps too but i havnt used that in a couple off crops it was just too hot for my space during the summer im finding the 400 just as goo for me, my attic ant that big. So were was i ye dont put the lamps that close what uve heard about plants falling over only usually happen when growing with the roung kind off light. Youre using a 400 am i right?. when growing young plants say before preflower dont get too close the hand tip works for me. Like i said back off the hand lower the lamp until it gets too hot. getting a fan will help drop temps by a couple of degrees so dont think by using the fan that you can have it on top off youre plants. Its been a few years since i grew NL and i havnt grown the cross with Big Bud so i cant help you much there Considering theres lots of Indica in the cross as said youre plants should creep up too much the Widow if it is Will be sativa dom if it is so youre garden wilkl be uneven how and ever. What i ment by full leaves a proper set of 5 of 7 as a plant grows the sets will have more leaves but wait another week at least with the NL..

Sorry for rushing Bud im supposed too be working LOLOL

Best of Luck D