Some people want to do more than just get by. You can watch nothing happen all winter or your plants can thrive all winter.
I like to thrive!
My trees to more than "just get by". ALL of my trees put on growth during the winter. I have to prune my BRT every month or so under my lights. I put BRT, willow leaf ficus and tiger bark ficus under my system.
My ficus also put on growth. I grew a willow leaf ficus from a 0.25 inch trunk to about 1.5-2 inches at the base spending most of the last 3 years under those lights.
I had one summer that I could not put my trees outside and they spent 18, months under those lights and grew the entire time.
In my definition that is thriving, not "just getting by"
I paid for my entire light setup for what two of those bulbs go for. I also imagine they throw off a lot of heat. My trees already burn themselves on my bulbs when they grow too much into it and they already add enough heat to the room. Those would incinerate them. No thanks.