Well my shops big side has 15 - 8’ twin tube fluorescent fixtures with old fashioned ballasts. My ceiling is 17’ up. I installed the fixtures on scaffolding with a 8’ ladder on top. I was younger then. Worked great as long as the temperatures were 50* or higher. I normally keep that side of the shop at a little over 40* in the colder seasons which is 2/3’s of the year or more, so dim light unless I fire up the wood stove. Now it’s bright at 40* and colder.
When LED’s came out the replacement for these fixtures was very expensive. I would replace a fixture’s worth when funds allowed. But, when I saw how bright by comparison to the fluorescent tubes, especially in temperatures down to 20* or colder, I started finding funds at a more rapid pace.
At least 30% to 40% brighter with 1/3 less electricity. Up here we are paying $0.27 per KW so the LED’s paid off fast. And the prices for replacement bulbs came down. But I did not have to replace the entire fixture.
The smaller side had 4’ twin tube fluorescent’s which I replaced with LED bulbs. Same thing, more light, less electricity. Once again did not have to replace fixtures. Also the 4’ replacement bulb x 2 = 28 watts total and the 4’ replacement fixtures were about 38 watts.
I’m happy with the replacements of bulbs and not having to mess with fixtures.