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Flickering Fluorescents #61135
01/17/06 03:39 PM
01/17/06 03:39 PM
T
Tiger  Offline OP
Member
Joined: May 2005
Posts: 706
Crystal Lake, IL USA
I have a client with undercabinet 1/2" fluorescent lights. She has them on approx. 12 hours per day, and after 2-3 months they start a very irregular flicker. I tried them today & it flickered a little at the start, then seldom, but occasionally.

Are these bulbs dying normally after only 750-1000 hours?

This is a replacement fixture. The previous was doing the same thing. It's not from a motor surge, and other fixtures in the room aren't having this problem. Pounding on the fixture doesn't make it flicker.

Thanks,
Dave

Work Gear for Electricians and the Trades
Re: Flickering Fluorescents #61136
01/17/06 04:10 PM
01/17/06 04:10 PM
W
wendel  Offline
Member
Joined: Aug 2004
Posts: 55
Try thoroughly cleaning the florescent tube. There's a very intricate relationship with the metal ground of the fixture that sometimes can be interfered with due to dirt/dust buildup on the tube.

Re: Flickering Fluorescents #61137
01/17/06 08:03 PM
01/17/06 08:03 PM
K
kale  Offline
Member
Joined: Nov 2002
Posts: 174
I would verify the grounding of the fixture, all the way back to the GEC if necessary. Sounds like a bad ground.

Re: Flickering Fluorescents #61138
01/18/06 01:57 AM
01/18/06 01:57 AM
Scott35  Offline

Broom Pusher and
Member
Joined: Oct 2000
Posts: 2,708
Anaheim, CA. USA
Sounds like loose terminations at the Lamp Holder - either holding the Lamps' Bipins, or the Wire(s) connected to the Lamp Holder.

They would loosen up in operation, due to heat.

Fun for Troubleshooting!

Scott35


Scott " 35 " Thompson
Just Say NO To Green Eggs And Ham!
Re: Flickering Fluorescents #61139
01/18/06 03:33 AM
01/18/06 03:33 AM
E
e57  Offline
Member
Joined: May 2003
Posts: 2,876
S.F.,CA USA
Cheap fixture? (Not a name brand electronic ballast)
Cheap bulbs? (maybe same lot or batch as the old one?)
Cheap ballast? (Same deal as with bulbs)
Grounding of the fixture can be an issue...
So can low available input voltage...
All of the above...

Then my favorite... improper burn in time of the lamps. Try leaving them on for 24 hours or more for the first start up, it helps... It is actually required for dimming lamps, but have noticed a difference in non dimming...


Mark Heller
"Well - I oughta....." -Jackie Gleason

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