Help converting T8 fluorescent to LED

Discussion in 'Electrical Forum discussion & Blog' started by hilander987, Apr 4, 2021.

  1. hilander987

    hilander987 New Member

    Joined:
    Apr 4, 2021
    Location:
    Tennessee
    I'm having an issue with kitchen lights. I'm in an apartment unit that used a light fixture with 2 t8 fluorescent bulbs (with electronic instant start ballast). I want to replace them with led bulbs. I removed the ballast and direct wired the tombstones (shunted), and the lights aren't coming on.

    Here's the bulb I'm trying to install
    https://www.ledmyplace.com/products...clear-dual-ended-power?variant=30107817345089

    here's the bulbs currently in the fixture:
    https://www.amazon.com/Sylvania-21777-FO32-830-ECO/dp/B07R623YPK

    direct wire config: 2 Blue wires on hot (black) one red wire on neutral (white)
    the tombstones, being shunted, and 1 blue wire coming from each Left tombstone, whereas the right side has a red wire coming from one tombstone, but a blue with black striped wire connecting the 2.
     
  2. fitter30

    fitter30 Well-Known Member

    Joined:
    Feb 2, 2020
    Occupation:
    Retired service tech
    Location:
    Peace valley missouri
    According to their bypass ballast diagram both pins on each side of the led bulb are tied together. One side get the hot the other neutral. Some of the tombstone sockets already have both pins powered together.
     
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  4. hilander987

    hilander987 New Member

    Joined:
    Apr 4, 2021
    Location:
    Tennessee
    yes, i have them wired correctly, they just dont come on. I tested a multimeter to the tombstone contacts and the wires and im getting no reading. But when attatched tot he main Hot and Neurtal i get 120v, which one would argue there is no power being supplied tot he tombstones, however the old flourescent bulbs worked fine (with ballast of course) the removal of the ballast couldnt of done anything to the power supply?
     
  5. WorthFlorida

    WorthFlorida The wife is still training me.

    Joined:
    Oct 28, 2009
    Occupation:
    Retired
    Location:
    Orlando, Florida
    You are miss wired and I think your getting confused with the wire colors from the tombstones. I've replace hundreds of T12 to LED T8. First remove all wires from the tombstones. This video shows how, very simple.

    Using the old ballast wires try to use the black and white wires. Insert the ballast wire in the correct side of the tomestone. You need only about 1/4" inch stripped back. Be sure that one end of the LED tube is for 120v is the black wire, the other side is the the neutral, (white). The LED tube only one pin on the end is used so using shunted tombstones doesn't matter but most are non-shunted. You can easily use a short length of ballast wire to jump across the tombstones and it becomes shunted. On these type of LED tubes the unused pin are not connected. After install with a sharpie pen, make a note how the pins are wire. Many LED tubes the hot and neutral are on one end only.

    It is easy to miss wire to the wrong pin. As you look down at the wiring diagram and then look up, and I've done it a few times, you can get the power to the wrong pins.

     
    Last edited: May 8, 2021
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