I rewired my 4', 4-tube fixtures for 5000k LED tubes. Nice to have instant light even when the shop is at 48F in the recent mornings.
We have a number of the "solar tubes" throughout the house. Totally eliminates the need to switch on a light during the day in the rooms without windows.
They are pricey, but I added a 10" for spot lighting over the table saw since there is limit places I could have the fluorescent fixtures installed. Still would like some more task lighting.
