Heck even I switched out my six 40 watt tubes for LED tubes in the larger shed. Lit maybe 200 hrs/yr. It wasn't obviously the money driving it. I may never reach the payback period.
I just don't like the unnecessary energy usage, the mercury contamination, the slow start and unreliability in cold temps, the short life and disposal problems of the old fluorescent tubes. It's a vast improvement any way you look at it.
But, I think halogen bulbs give a far better color spectrum than incandescent, fluorescent or LED bulbs -- at least from an artist's perspective.
LED's are improving that way, but you really have to look at the specs to tell if you're getting something pleasant to live with. fluorescent were generally poor that way as well, so for shop use, LEDs are no worse and might be an improvement.
I usually like a warmer light environment, so I go for the ~3000 - 3500 K +- "soft white" types instead of the "daylight" types at 4000+ K, and look for 90 or better CRI (color rendering index) in the home so there aren't big holes in the color spectrum.
A few years years ago a local coffeehouse changed over to LED fixtures (with non-removable bulbs) -- talked into it by an electrician because their old incandescent ceiling fixtures and wiring were having ground problems. The owner was proud of the change, but after the change customers looked like walking cadavers, and the art shows on the walls might have been painted in gray tones. It was (and still is) an ugly light to sit in.
