I've been reworking the lighting in my GH since my seedlings are too scrawny and feedback (on this site as well as from Rare Seeds/Baker Creek indicates I likely don't have enough light). So I purchased some T5 tube fixtures and bulbs. I still have 6 clip on lights with CFL . However, there is such conflicting information on the web about whether lumens is important. One very detailed site talked about the need for 3,000 lumens per sq. ft - that was an article on growing marijuana (which is not in my GH), but it's a green plant. Other sites say lumens are not important - only K rating. My new T8 tube fixtures will each have two 6500 K bulbs at 2900 lumens each - My intent was to put that over a 18" x 3' shelf - and I had hoped that would be enough light - but maybe it won't. Maybe I'll have to put both fixtures over one shelf and buy two more for the next shelf over ?
