I went around the house and counted all the 60W then the 75W/100W bulbs I had, then bought the corresponding LED replacement bulbs here:
For fluorescent light conversion:
https://www.amazon.com/s?k=led+4ft+light+bulbs&crid=HFY4EX95EWVF&sprefix=LED+4%2Caps%2C87&ref=nb_sb_ss_ts-doa-p_2_5
And here’s how to prepare your 4 foot fluorescent fixture for the new LED bulbs. EASY