I replaced all my 4' fluorescent tubes with LED tubes from Walmart and I am quite happy with them. They are much brighter than the old fluorescent bulbs. I did NOT have to remove the balast before installing the LED tubes in fluorescent the fixtures.
I grew up in Gladstone and my father worked at the Milwaukee plant when Proto was owned by Ignisolrand then after it was bought out by Stanley. He was the plant manager when they closed the plant in cica 1987 after which we moved to Texas where he headed up the product engineering department...