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Thread: T-12 and T-8 Lumens

  1. #1
    Join Date
    Feb 2003
    Location
    Bremerton, Washington
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    6,608

    T-12 and T-8 Lumens

    does this sound right for average mean lumens
    T-8, Lumens 2520
    T-12 Lumens 2610
    Moderator-Washington State
    Ancora Imparo

  2. #2
    Join Date
    Dec 2006
    Location
    Chapel Hill, NC
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    25,968
    I thought the T-8 had a higher lumen than the T12.

    I found this for T-8 , 4' tubes

  3. #3
    Join Date
    Jul 2007
    Posts
    190
    Quote Originally Posted by tom baker View Post
    does this sound right for average mean lumens
    T-8, Lumens 2520
    T-12 Lumens 2610
    Pretty generic! :grin: It will depend on length, color temperature, CRI, manufacturer, and lamp variety (TCLP compliant, long life, extra-life, etc.).

    But for your generic 4' 4100K T8 lamp with a CRI of 78, it is 2660 mean lumens. For a close comparison the T12 at 4100K with a CRI of 80 is 3050 lumens. There is a wide variation once you start changing the variables.

    Your best resource is the GE Lamp catalog: http://www.gecatalogs.com/download.html

  4. #4
    Join Date
    Jul 2007
    Posts
    190
    Quote Originally Posted by Dennis Alwon View Post
    I thought the T-8 had a higher lumen than the T12.
    No. The benefit of the T8 over the T12 is the lumen per watt value. Remember you are comparing a 40W T12 versus a 32W T8. So you are saving energy, providing a better lumen per watt ratio, and typically a better CRI.

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