do you think one could grow two plants? How much did your electric bill go up?Lol I don’t sell anything. Just what I’ve been using and what I went through to get here. I usually run one plant under one cob. Sometimes three under my four. Yeah u can run one. Go check out the cob shop section here on this site. Plenty of grows there. check out some grows. I wish someone pointed me in the right direction when I first started. I wouldn’t have 20+ t5bulbs sitting here with two fixtures and a blurple back in the box collecting dust. Lol. They r also very efficient and u can add one at a time and adjustable for height