Just for the smell. Although if you use a carbon filter you need an in-line centrifugal fan. One of the cheap booster fans won’t cut it, they are meant for airflow only and don’t have enough static pressure to run with a filter.
Yeah they are Molex. Apparently, Molex is actually a company. I’m used to the term Molex being used for the 4-pin PC connectors.
Get 2 of the 4-packs of HLG QB 120's and 2 Meanwell HLG-240H-24A drivers. (Link)
Place a 315w CMH in the middle of each tent with a QB 120 on each corner. Would come out to around 550w per tent with great spread and mix of spectrum.