I've been running LED since 2015. Same Cree Cxb3070s I built myself. Environment has ALWAYS mattered. Even when I was rocking 6000 watts of HID lol. VPD is great, but feed can be adjusted in lower humidity/temperature and be pretty comparable. I noticed my biggest jump in consistency and yield switching from FFOF/promix bx peat type soil to pure Coco in smaller containers DTW. I like higher humidity through week 3/4 then lower and lower (temp too) til the end. If I can finish in the 30s or 40s rh% and mid to low 70s daytime temps I will. I've noticed quality goes way up if humidity is lower in the last 3 weeks of flower. To each his own. These forums taught me a ton. Experience taught me exponentially more. The best advice to me always came from the most experienced growers. Also, I NEVER give my plants more than 1.4 ec MAX. Usually between 1.2 and 1.3. Even in peat that was a game changer for me. The low ec feed thread by homebrewer (I switched to jack's in coco, but used his dynagro grow as a standalone in peat mixes), posts from
@UncleBuck , the coco DTW thread, and the Diy Led thread from
@SupraSPL with contributions from many including seamaiden and greengenes, et al., changed my life.