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Home /  Support Center /  Knowledge Base /  T8 LED tube lights /  Do you have a 4-ft full spectrum bulb suitable for T12 fixtures?

Do you have a 4-ft full spectrum bulb suitable for T12 fixtures?


I have two 4-ft spectrum bulbs that are getting old they are fluorescent (TRU LIGHT ULTRA F40T 12TLU). I don't know if I need a fixture or not.

It appears that you currently have a T12 fluorescent lamp in a 4-ft T12 fixture. The good news is that our T8 lamps will fit in your existing fixtures, but the existing fluorescent ballast will need to be removed or bypassed.

​Once the ballast removal or bypass is complete, you will be able to use our T8 LED tube lights in the same fixture. 


Question posted under:

T8 LED tube lightsCeiling FixturesFluorescent replacements


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