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Q: T4 lamps ( Answered,   1 Comment )
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 Subject: T4 lamps Category: Science > Technology Asked by: besparkle-ga List Price: \$2.00 Posted: 07 Sep 2006 15:55 PDT Expires: 07 Oct 2006 15:55 PDT Question ID: 763180
 ```I know that the T in T4 stands for Tubular. What does the 4 stand for? (in the case of a T4 lamp) or the 5 in the case of a T5 lamp? Thank you```
 ```Howdy besparkle-ga, The comment by stanmartin1952-ga is absolutely correct in that a T4 lamp is 1/2" in diameter. But, what if it is a T5 or T8? The website of the UK based Lamp Company provides the answer for us on one of their Glossary pages. "T2, T4, T5 , T8, T12" http://www.lampco.co.uk/glossary_t2t4t5t8t12.asp "Refers to the diameter of a fluorescent tube (in 1/8th of an inch) ..." So, a T5 lamp should be 5/8" in diameter, and the "Lighting Research Center" website from Rensselaer Polytechnic Institute's National Lighting Product Information Program verifies that, and provides illustrations and metric conversions as well! http://www.lrc.rpi.edu/programs/nlpip/lightingAnswers/lat5/pc1.asp "T5 lamps have a diameter equal to 5 times an eighth of an inch, or 5/8"." If you need any clarification, please feel free to ask. Search strategy: Google search on: T4 T5 lamps ://www.google.com/search?q=T4+T5+lamps Looking Forward, denco-ga - Google Answers Researcher```
 ```T4 seems to stand for 1/2" diameter: http://www.budgetlighting.com/store/agora.cgi?page=microfluorescent_under_cabinet_ultra-thin_fluorescent_fixtures.html```