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If I added 2 - 4' t5 fluorescent grow lights hanging a few feet above and use the led's as fill, do you think that would be sufficient light?
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No,. First, like LED's the light intensity (lumens/lux, ect..) drops significantly beyond 2 feet. Second strawberry plants are fruiting plants and need more light than non fruiting plants. You might be able to get by with a twin bulb T5 light fixture 6 inches above each row, but I still think for fruiting plants that may be lacking.
I think your biggest lighting issue are the lighting choice and coverage ability. If you placed the rows side by side instead of on top of each other, you can get much better coverage. For the LED, I would still think you would at least need one of those 12 watt
bulbs per plant, six inches above the plant. But the close proximity should increase the light intensity at the plants, and ultimately yield better results simply by the different configuration. You could also place a reflective surface underneath to bounce residual light back up.
Again I would still expect to need a twin bulb T5 light fixture for each row, but again the close proximity will increase the light intensity at the plants for all the rows. Bottom line though, watt for watt, HID lighting will give you better coverage, and better results/light intensity for fruiting plants. But that's just my 2 cents.