Florescent Light Help

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  #1  
Old 09-13-06, 05:46 PM
Gen
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Florescent Light Help

I've got a florescent that sometimes comes on right away when switched, and sometimes takes seceral minutes to come on.
I just replaced the ballast--a magnetic type. But it still does the same thing.
I'm sure it's the correct ballast.
I'm also sure the fixture is grounded.
The bulbs are 2 U-shaped ones about 20" long.
OK I give up--what is the problem?
(Could it be something intermittent in either the switch or contacts?)
Thanks Much.
 

Last edited by Gen; 09-13-06 at 09:39 PM.
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  #2  
Old 09-13-06, 08:29 PM
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Where is this fixture located? What type of fixture is it? How old is it? It may be more advantages to change it with new, than to repair.
T-12 Lamps? did you change BOTH lamps? Do they have a metal strip on them? (tin foil looking) If so, Get the ones with out that.
You are sure the fixture and ballast are grounded?
Try an electronic ballast.
 
  #3  
Old 09-13-06, 09:32 PM
Gen
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The fixture is in the kitchen,
I did not change the lamps, since they are both fully bright when on.
They do however have a metal strip in them. What is this, and why is it undesireable?
How do you ground the ballast? I see no means to do so.
It has black paint and it's mounted to the glossy white fixture surface.
Thanks.
 
  #4  
Old 09-13-06, 09:46 PM
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For what it's worth:
I worked for over 20 years in a retirement center which had 2x2's in the kitchens, using these "U tube" lamps. We had the exact problems you are experiencing, and it seems to be related to a grounding issue. It seems that even though the fixture is adequately grounded, the lamps needed to be closer to the metal fixture for reliable starting. We installed the tubes with the foil strips on the "backbone" of the bends, which happen to land directly under the grounded support clip. We had somewhat better operation with these rather than with the plain ones.
I also noticed that humidity affected the starting performance of these lamps...
Good Luck!
 
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Old 09-14-06, 04:47 AM
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For what it's worth, I was having a problem like this and asked around, (The lamp mfg Syl....,) Some friends had the problem too (in the trade.) One of them had been told by the supplier to remove that strip, He did and it worked, I did the same on my problem with good results.

Forgot the reason, Il'll ask today and pass it on.
 
  #6  
Old 09-14-06, 05:16 AM
Gen
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I'm not sure what you mean by remove the metal strip, can you explain. since it seems to be inside the tube. Thanks
 
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Old 09-14-06, 04:15 PM
Gen
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OK I removed the metal strip, which really was a foil tape on the outside, and NO MORE PROBLEM.
FANTASTIC!!
So what's the metal foil for, and why was removing it necessary?
Thanks a million.
 
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Old 09-14-06, 04:26 PM
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The strip is on the outside of lamp from end to end.
Not sure what it is for. But it should just peel off (it's tape).
Better still by 2- new lamps and see.

This was not a new problem for some I spoke with, New to me.
It worked so I passed it on.
 
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