humidity is kinda low. 40%-60% are good humidity levels. make sure your ventilating the grow space to bring in fresh co2 or have a co2 generator or homemade co2.
water your plants when the top 1" soil is dry. fertilize every other watering with soil.
I did a reflector light chart on this lumesun reflector. a 1000w bulb fits perfectly in it. and it gives you the most light out of any reflector. the problem is though is that the light spread is uneven, so a light mover is highly recommended.
1000w will get 3 feet of penetration usually depending on the density of the plant. the green portion is still a good amount of light. Really for any 1000w light i would do 12 - 3 ft plants. a 4 x 3. your right about 3 & 4 being much happier. thats why light movers were made so you can move the...
search leaf spot of leaf blight on google and youll see. ive never had so im not sure the BEST way of getting ridding ofit. i heard unfortunately it hard to cure.
how long have you been flowering? its not temp 55 at night is no biggie. if it hit below 50 then i would get worried, but pot is a pretty hardy plant. here a college paper on temp.
http://www.cmg.colostate.edu/gardennotes/143.pdf
It look like you can bump up your blooming nutes a bit, but if...
inline booster fans are quiet just the way they are shaped, but you can forget using them if you have a carbon filter. they cant handle the pressure. That's why inline centrifugal fans are popular because they are quite powerful and can overcome resistance caused by carbon filters and ducting...
Optimal Distanse highly depend on the wattage, but also highly depend on the reflector. the huge xxxtreme hoods can be placed 6" away for a 1000w while our small refelctor must be placed at least 14" away.