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Dimmable ballasts with non-dimmable CFL's?

  1. Jun 14, 2010 #1
    Thanks for you time,

    I need to order some samples for testing (work-related). I need to order some particular brands of dimmable ballasts, and I obviously need to order some T8 fluorescent tubes and other 4-pin CFL's, to test some dimming circuitry.

    I understand a stand-alone CFL bulb can be classified as dimmable or non-dimmable. The internal difference in these two types is the dimmable CFL contains a ballast circuit inside that allows for dimming. Whereas non-dimmable CFL's have no such ballast.

    But if I wire a dedicated dimmable ballast unit with non-dimmable CFL bulbs (4-pin models), could the dimming still work? I'm including a dimmable ballast unit to work with CFL bulbs, whether the CFL bulbs have their own dimming ballast or not. Could the dimming work because I am adding the dimming ballast myself?

    Thanks in advance for your answers!
  2. jcsd
  3. Jun 15, 2010 #2
    You must not connect a ballast (dimming or otherwise) to a lamp that already has a ballast in it.

    If this isn't what you mean then it will probably work.
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