I replaced some fluorescent bulbs recently and found LED tubes - they're the same form factor, but inside are a line of LEDs. They lightg up quickly and don't flicker like fluorescents do.
At about $20 a piece, they could add up.
But the LED variety cost even more.
I bought mine (60 cm T8) from AliExpress for about 5 EUR each (free shipping). They were connected so that all I had to do was remove the starter. Removing the ballast is optional.
https://www.aliexpress.com/item/32797875292.html
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