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Can I Use a T8 LED Tube in a T12 Fluorescent Fixture?

por Stanton Spring (2019-08-10)

Can I Use a T8 LED Tube in a T12 Fluorescent Fixture?
Buyers of LED fluorescent replacement tube lights often ask if they can use a T8 sized LED tube in a T12 fixture. We cover most of the basics on how to choose LED tube lights for your application here but customers are often confused after purchasing when they receive an LED that is marked as T8.
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As we describe in our how to article, T8 and T12 feature the same G13 bi-pin connector. T8 tubes are simply 1 inch in diameter versus the 1.5 inch diameter of T12 tubes. In an effort to make LED tube lights compatible with the internal dimensions of most fixtures, you will find that most LED tube lights feature a T8 or 1 inch diameter. They can indeed be used in T12 fixtures. With this said, T12 fluorescents for the most part use magnetic ballasts therefore, the only way to use LED tube lights with this type of fixture is to either purchase an LED ballast bypass tube light and bypass the ballast wiring or purchase a universal magnetic ballast compatible tube light.
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Please note that the above information is primarily directed towards 4 Foot bi-pin G13 T8 and T12 products.
irst off… T12 use 40watts… T8s use 32watts. The ballasts don’t convert 120 into 277. This is just showing you that the ballast can be used in 120v and 277v systems. 277 is used frequently in office buildings/commercial applications. You are better off getting a conversion kit, using new electronic ballasts and T8, or even better, LED T8’s. Hope this helped, best of luck.
Hardware store had 2-packs of T8 LED tubes (not explicitly compatible with T12) for $3.75, so I wonder about the electrical stress on these T8s in a T12 fixture.
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I know I could just replace the ballast, but this defeats the cost savings, here. The lights look great. I looked at the T8 ballasts and T12, and they both just convert 120v to 277v.
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What could happen? Shorter life? Fire? Tear in the time/space continuum?