As the subject reads. I currently have 2 grow racks with 2 20W fixtures each. I'm currently just using 2 GE T12 20W cool white tubes from wally world. I started researching when I heard cool white alone doesn't provide enough spectrum for good growth. I also wanted a bump up in lumens. When I started looking at some broad spectrum bulbs, I noticed their output was considerably less. (1180 with the GE, about 900 with grow bulbs.) What are some good choices? Can I upgrade to HO bulbs by just upgrading the ballast? This is for mostly neps and drosera. Any feedback is appreciated.
---------- Post added at 12:07 PM ---------- Previous post was at 11:55 AM ----------
I was also considering a sheet of mylar behind each stand to reflect some light back and not lose so much to the surroundings.