Gene, do these T5HO bulbs put out enough light to burn shade lovers? I have a suncalk, measure light over a 12hr period and at 6" from the bulb rate it as part sun. I have some blocks of 2x4 and 4x4 to raise plants. I'm 4 to 6 inches from the bulbs.
It appears that many of my young Hoya cuttings like this increase in light, it could be just the fact they finally have a good root system established.
I have 4 more T5's for my outdoor succulents, under the eaves to keep dry and a clear cover, I hope it adds enough heat to keep from freezing. Last winter was mild, lowest temps around 25f but I need to be ready for 15f or lower. I can get a cold Columbia Gorge wind sometimes.