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Old 03-06-2011, 10:24 AM   #1
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quick fluorescent lighting question


Hi people,

I have a 4' 2 bulb fluorescent lamp fixture (shop light type), and the sticker on the fixture says Use Only F25T12, F34T12, or F40T12. I have laying around one 4" bulb that says F32T8/TL741 (the newer type/narrower diameter bulbs). I could buy a second one of course, IF that bulb would be a fit. can I use it? What do all those #'s mean, guys?

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Old 03-06-2011, 10:39 AM   #2
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quick fluorescent lighting question


The T8 bulb should not be used with that ballast.

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Old 03-06-2011, 10:39 AM   #3
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quick fluorescent lighting question


Let's see if the old man's memory is anywhere near correct: "F" stands for fluorescent, the next two numbers (25,34,40) stand for the nominal wattage, "T" stands for "tube" (go figure), and the "12" or another number here would be the nominal diameter in millimeters. The "12" would be what we are used to in the 1 1/4" size, and the newer "T-8" would be the new 1" size. I stand to be corrected on this, but bet I'm close. AND: Have you noticed the pricing increases in the past year on fluorescent lighting tubes? You'd think they were gold plated inside instead of mercury.
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Old 03-06-2011, 10:41 AM   #4
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quick fluorescent lighting question


The number after the T is the number of 1/8" inches the tube measures in diameter. Therefore a T8 = 8/8s or 1" diameter.
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Old 03-06-2011, 11:53 AM   #5
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quick fluorescent lighting question


The T8 bulbs will physically fit in the T12 lampholders, but the ballast needs to be changed to a T8 ballast to work (and last) properly. Kicker is that it's just about as cheap to get a complete fixture with a T8 ballast already in it as it is to buy just a replacement T8 ballast.
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