Can I Replace fluorescent tubes in high kitchen ceiling?

It depends how old they are, many can. I can't replace all of mine (from the 80's) in my basement. I can't even get a replacement ballast, and I have gone to specialized electrical shops. I can still get regular tubes.

Having said that, in some cases it is cheaper to install a new housing than retrofitting. The LED "replacements" are astronomically priced here. I don't want to invest that kind of money for an old system.

Take a picture of the tube (there should be info on it) and the prongs. Maybe it will work for you, good luck.

https://www.homepower.com/articles/home-efficiency/electricity/changing-fluorescent-tubes-leds

Hi,my home also built in the 80s has the exact lighting in kitchen. And no they do not make LEDS in our size. I'm not an electrician so I can't help you there either. The only thing I can suggest is to have someone install a new light fixture for you. When they took my old down and put the new one up you couldn't tell.

I lost the ballast in my kitchen fixture and replaced the tubes with four 48” 120v LEDs. $8 ea. The ballast had to be bypassed, and the lamp holders had to be modified for the new hookup. I don’t recommend it for non-electrical types.

If the tubes are made for 120V end-to-end it's a pretty easy upgrade. Mine were made for 120V pin-to-pin on one end, so I had to 'split' the connections on the lamp ends. Removal, modification, and reinstalling ate up so much time, not sure it was worth the $ saved.