Which T5 HO bulbs work best?
I know, that probably is too general of a question. My fixture is a double bulb T5 HO on a 20g high tank so 48 watts or a bit over 2 per gallon. It sits 17 inches above the substrate, (Caribe sea sand), and about 4 inches above the water surface.
In the past I had heard that T5 HO lights were more powerful and that the same watts per gallon formula that we used for T8 bulbs was not really accurate any longer and lately there have been so many advances in lighting that I no longer feel like I know how intense my lighting is or what the best bulbs to run are. My plants grow well and I do not have an algae problem but it is time to get new bulbs so I thought I would ask for opinions.
I am currently running one 6500k daylight bulb and one Zoomed Floralife gro bulb about 9 hours a day. What would you buy for this fixture?