I have old 4ft fluorescent fixtures in the basement (about 10 years). They are the NEW232120REBN from Lithonia. The T12s are dying out so I bought some Philips InstantFit 32W-equivalent T8 LED tubes.

The thing is that the new LEDs don't work as pairs, just one per light fixture. I was hoping to for a lot of light from these, it's a major bummer to get light only from one side.

Some thoughts:

  • There is no visible ballast, but I don't know anything about ballasts. I think it's an electronic ballast, but that's all I can figure from my research.
  • I have some dimmers nearby, from Lutron, but these lights aren't on dimmers
  • The holders (tombstones) seem to be pretty worn, but they click in and out ok.
  • In one or two of the fixtures I put in the LED next to a fluorescent and it lit but super dim, like 10% of the light it should have.

Any tips? I'm totally lost as what to do next. Thanks in advance.

  • 1
    Can you confirm "no ballast"? A ballast is a box typically 1" x 1.5" x 9" at the smallest. However there are some very cheap fixtures which have a few little black boxes scattered around the fixture, which substitute for the ballast. How do you feel about rewiring the fixture for "ballast bypass"? Jan 15 at 3:58
  • OK, found the ballast. Sunpark SL15 electronic
    – opendatum
    Jan 15 at 16:17
  • How long did it take the last set of T12's to fail? I'm particularly interested in the number of starts.... Jan 15 at 19:21
  • Most of the T12s are at least 5 years old. Not many starts though since they are in a basement.
    – opendatum
    Jan 16 at 20:22

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