Replace all 4 lamps, that would be two trips up and down the ladder. one to remove all lamps and one to replace the lamps. Then if you need to, set up a fixture on a bench test the lamps and mark the bad ones and dispose of them. At that time you could make sure the older lamps were bright enough or just worked. Are these 4 foot or 8 foot lamps? I am going through the same thing in my shop and am switching to the LEDs. I bought 6 lamps on line just to try out and love them. These use no ballast or can be used with the existing ballast.Ordered through Home Depot " Euri Lighting ET 8-1140H or ET 8-1150H" free shipping with a like $50. order. The great thing about these is it does not take 2 or more lamps to work. In some of my fixtures I only used one lamp instead of 2, still enough light. hope this helps joe retired sparkey
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Today's Featured Article - Grain Threshing in the Early 40's - by Jerry D. Coleman. How many of you can sit there and say that you have plowed with a mule? Well I would say not many, but maybe a few. This story is about the day my Grandfather Brown (true name) decided along with my parents to purchase a new Ford tractor. It wasn't really new except to us. The year was about 1967 and my father found a good used Ford 601 tractor to use on the farm instead of "Bob", our old mule. Now my grandfather had had this mule since the mid 40's and he was getting some age on him. S
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