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#59914 - 12/18/05 08:22 PM flourescent light fixture  
circuit man  Offline
Joined: Nov 2001
Posts: 273
here's a good one that has me stumped, about the above. bought a brand new fixture a couple of months ago,the rapid start type belive it's 20 watt ,two bulb. the problem is sometimes it comes on by itself sometimes not.i have changed ballasts, grounded it properly,& it still takes a notion not to work it doesn't.both ends of each bulb glow but want seem to start.but as soon as i touch the fixture it comes on.the bulbs are as close to the frame as possible.i had those $8 shoplights to work with only two wires before i got my shop wired. they never give a bit of a problem.even the ballast maker couldn't answer my problem.they even sent free replacements.but sometimes ya flip the switch & it comes right i wonder what the problem coud be?

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#59915 - 12/18/05 09:03 PM Re: flourescent light fixture  
mxslick  Offline
Joined: Oct 2004
Posts: 803
Atomic City, ID USA
Try changing the bulbs. Since the big environmental crusade, F-lamps contain a lot less mercury than before. (The mercury vaporizes and aids in starting.)

And avoid the ones with green end caps, they're the worst!!

Even with name brands, defective bulbs seem common these days.

Stupid should be painful.

#59916 - 12/19/05 01:22 AM Re: flourescent light fixture  
hbiss  Offline
Joined: Dec 2003
Posts: 886
Hawthorne, NY USA
Agreed. I have solved this same problem by using another manufacturer's lamps. U tube fixtures are notorious for this. I have had good luck with GE bad luck with Phillips. Also, as said try to stay away from the energy saving reduced wattage low mercury ones. The full wattage energy hogs usually work best. Maybe the energy saving lamps save energy because they don't work half the time. [Linked Image]


#59917 - 12/19/05 07:18 AM Re: flourescent light fixture  
LearJet9  Offline
Joined: Apr 2005
Posts: 197
Millis, MA USA
Change to T8 lamps with an electronic ballast, your problem will be solved.

#59918 - 12/19/05 07:24 AM Re: flourescent light fixture  
Dnkldorf  Offline
Joined: Dec 2004
Posts: 1,064
nowhere usa
+1 for the T-8....


#59919 - 12/19/05 10:12 AM Re: flourescent light fixture  
renosteinke  Offline
Cat Servant
Joined: Jan 2005
Posts: 5,316
Blue Collar Country
Just for grins & giggles, look closely at the wiring diagram on the ballast. It sometimes matters which bulb (or bulb end) gets fed first.

#59920 - 12/19/05 05:06 PM Re: flourescent light fixture  
circuit man  Offline
Joined: Nov 2001
Posts: 273
THANKS GUYS! i'll check on the parents are about to drive me nuts abot this. especially my mom!LOL!why would touching the fixture cause the to come on though?i'm lost on that one. but it seems to work every time.

#59921 - 12/19/05 06:09 PM Re: flourescent light fixture  
jwhite  Offline
Joined: Dec 2005
Posts: 64
Trenton, NC, USA
when you touch the bulb you get the little molicules of phospores (sowwy spelling) excited.

#59922 - 12/19/05 07:17 PM Re: flourescent light fixture  
Edward  Offline
Joined: Dec 2002
Posts: 308
Do you have to wait for a while then touch the fixture for it to come on?

Could there be a loose connection or a bad/corroded connection in the line somewhere that you do not get the full supply voltage when you turn the switch on?


#59923 - 12/20/05 06:52 PM Re: flourescent light fixture  
circuit man  Offline
Joined: Nov 2001
Posts: 273
hi ed, no paticular time involved. was down there tonight & it came right on twice. the third time it didn't. touched it ,then it came on. sometimes you would turn it off & it would come right on.i know flourescent lamps are tempature senstive.but this doesn't seem to be the case.all connections are ok too. i may try some different bulbs.then i may attach a wire to the fixture so they can touch it.LOL!

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