I swapped my old 65W fluorescent tube, no longer made they are now 58W for a LED tube from Screwfix, it is just 24W and since very little between light output fluorescent to LED it is half the light output of the old fluorescent 2400 lumen instead or around 5000 lumen for the fluorescent, but the spread of light is the same, and be it kitchen where I swapped lamp or garage where you are looking it is not the amount of light but the spread of light which is important. I have not really noticed the drop in light level, I know using my camera in the kitchen the camera settings show the light level has dropped, but not noticed with my eyes.
I think for what they are they are expensive compared with fluorescent, with a HF ballast with a fluorescent you are looking at 95 lumen per watt compared with 100 lumen per watt with LED and the life is not much different. But the fluorescent seems to dim more with age than the LED so there is a slight advantage with LED. But LED cost around 3 times that of fluorescent. Where the LED gains is you can have a 5 foot tube at 2400 lumen or 5000 lumen you can select, but with the fluorescent tube the output for a set size is pretty well fixed.
With non fluorescent tube replacement you really do need to look at lumen per watt, although they can get 100 lumen per watt, to make the lamp cheap and dimmable often they are as low as 60 lumen per watt. So not always good idea to replace with LED.
