Ok coo there 14 inches away not bad , personally if ima use bulbs ill go with multiple cfls just because i know it wont get so hot in there that could mess around with my humidity , have a fan by her side youll be fine i have a space in my room and it has no door so my wall ac its actually the fresh air ofc i have a fan dou , for nutes always remember your plant wont react to the new food until it drinks up/gets thirsty depending how many times u water is how many times your plant actuallt gets thirsty also high humidity will have your plant drink less due to water vapor in the air your plant can absorb that through her leafs , with that being said your plant will react whenver it starts drinking which is 1-3 days , NEVER go by what your damaged leaves tell u , remember there damamged although it well slow down the deficiency but your new growth your new shoots should look good green and healthy if there growing weird and gaining weird symptoms meaning your leafs growing weird or u still have deficiency then it can be your ph or in need of a particular nute some deficiency look alike so be careful, i read your ph is 6.0 thats good 6-6.8 is mines i would love to see those roots