That's a backward step. By the time a decent LED lamp dims enough to be noticeable, you'll have replaced the fluorescent lamps at least 2 to 4 times and some ballasts as well. Fluorescent lamp life is greatly shortened by frequent switching, like what happens in a home shop.
Fluorescents also use about 3X the power for equivalent light levels. Technically, LED's don't make a lot more light than fluorescent, but almost all of the light produced gets out of the fixture & onto what you're trying to light up. The price difference between fluorescent & LED has closed to the point where you'll save enough in energy cost to pay for the extra in just a few months.
So, you're basically throwing money away by replacing LED with fluorescent.