While LED Tube (fluorescent replacements) may produce fewer lumens than the equivalent fluorescent tube (while using about half the power), the light is (largely) directed downwards.
This means that they appear as bright (or even brighter) than the fluorescent tubes which they are replacing.
My experience with this is replacing two single (not too old) fluorescent tubes in battens with Osram SubtiTUBEs (1200 mm, 16 W 2200 lm)
I first replaced one and compared it with the remaining fluorescent and could see only that the new LED appeared to be very slightly brighter than the fluorescent. (Of course, I then replaced the other one.)
Then there are "LED Panels" - of various dimensions.
These can be obtained in sizes which approximate the area occupied by a pair of fluorescent tubes (1200 x 300 mm) but, because almost the whole of this area is "glowing", there is more light - or so it appears.
Again, my experience with this is in having a dual fluorescent light replaced with a LED Panel.
Interestingly, some of these LED Panels can be adjusted at installation to produce different "colour temperatures". (e.g. 3000 K, 4000 K, 5700 K)
This could be useful in a domestic situation, if the initial colour temperature chosen is not "liked" by SHMBO.