OT: flourescent tubes question.

jose bagge

Well-known Member
Kids had been complaining about how dark it was in the basement, so I went an bought a case of tubes and started replacing.
After puting in 28 new tubes, 4 to a fixture, I can say that the basement is only marginally brigher- most fixtures ( all on the same switch) have only two bulbs lighting. Wiring issue? Balast? These fixtures (4 footers for suspended ceiling) are only about 8 years old- can these ballasts be bad already? Ballasts about $30, whole fixture about 45...just replace the fixture on the assumeption that 2nd ballast is about fried too?
Tubes: I always thought that the pins should be parrallel to eact other end to end, but this is NOT the case on all of these Sylvanias bought from Lowes in a commercial pack- some look to be off by 10 or 15 degrees. Is this a problem?
These are T12 tubes....can T8 tubes fit in the same fixture?
In one room, with two fixtures- flip the switch, only one fixture lights. Flip again, other lights. Keep flipping, both will light. None of these fixtures have starters.
What do you think?
 
The pins touch contacts on each side as they are rotated into place. The slight difference should not matter. With them on, rotate the bulbs that are dark to see if they will make contact. If bulbs work in a given location, you know they are good, Use 2 known good bulbs to assess the ballasts in the fixtures. Put a bit of tape on them to keep track. Jim
 
That's exactly why I removed all of the tube flourescents in my shop. It often took longer to stroke the tubes to get them to light than it did to complete the job that I turned the lights on for.
 
That's exactly why I removed all of the tube flourescents in my shop. It often took longer to stroke the tubes to get them to light than it did to complete the job that I turned the lights on for.
 
T-8 tubes will fit. But they will not work properly with T-12 ballasts. And that is an understatement. It is easy to install tubes with one of the pins outside the socket. It will work, sort of, for a while.
 
The T8 tubes will not work with a T12 fixture.

I also think the T12's will not be available after a certain date. You might want to install T8 fixtures when any are replaced.
 
install a lot of ballasts at work(public school system)
new electronic ballasts with T8 lamps work great
go to a electric supply house and get some good 4 lamp T8 ballasts
gut your fixtures and rewire with the new ballast(1 per fixture) using old sockets
problems will be gone
Good Luck
Ron
 
The ballasts burned out because the failed lamps were not immediately replaced.
Another way to ruin a ballast is to be cheap and install one new lamp with one old lamp on the same ballast.
 

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