Take into consideration that you will have to replace the Fluorescent bulbs at least once a year. After I build and paid from my lighting, I was not getting the growth I thought I would. After lots of research, I realized that fluorescent lights lose lighting power over 6 to 8 month period, and need to be replaced to stay at full productive power. Now I have fruiting plants, not just lettuce.
So now LED lights became not so expensive, boxes of bulbs every year add to the operating cost. I just changed out one bank of T-8s for LEDs, and hope to do more over time. Just wish I would have known that before I built!! Just food for thought!