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florescent light won't work

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Forum topic by Karda posted 04-18-2018 04:16 AM 552 views 0 times favorited 19 replies Add to Favorites Watch
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Karda

1068 posts in 548 days


04-18-2018 04:16 AM

Hi, I have a 4’ florescent shop light and one of the tubes won’t work, thought it was lose but as i rote it it will flah at one point but it wont stay lit. I took it out and replaced it with the good bulb still didn’t work. Will one tube work or do you need 2. I took the light apart but did not see any lose connections. Any body have any idea what it may be. Could it be the ballast, it is an old light. Thanks Mike


19 replies so far

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mel52

309 posts in 259 days


#1 posted 04-18-2018 04:55 AM

I am not an expert on these but almost sounds like the pin or whatever you have holders might be spread apart to far. When they are in the locked position they may not be making full contact. Might explain why they flash when turning. Just my two cents worth.

-- MEL, Kansas

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Loren

10377 posts in 3642 days


#2 posted 04-18-2018 05:30 AM

I’ve read up on this a bit because I have the
same sort of thing going on with my lights. I
think the ballasts are the cheapest the makers
could get and that’s why they fail. I do have
one pricier fixture that has never acted up but
the cheaper ones I got for like $12 ea. years
ago at Home Depot are showing their age.

In my experience one tube will work. You can
sand the contacts with 220 or finer grit, that
can help with oxidation. I’ve done that on
dodgey magnetic switches with some luck.

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Karda

1068 posts in 548 days


#3 posted 04-18-2018 06:54 AM

thanks I was wondering if it was the ballast the light is old and cheap and they don’t last good. I was just hoping it was something simple. thanks for your help Mike

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Hermit

186 posts in 1320 days


#4 posted 04-18-2018 12:00 PM

Some of these lights will work with only one bulb and some will not. If you’re handy, just replace the fixture. By the time you’ve purchased bulbs then determine its the ballast, you’ve already spent the same as an inexpensive LED.

-- I'm like the farmer's duck. If it don't rain, I'll walk.

View Lazyman's profile

Lazyman

1937 posts in 1382 days


#5 posted 04-18-2018 12:37 PM

Sounds like the ballast to me. I’d replace the fixture with an LED one. It’ll be cheaper in the long run anyway because you’ll use less electricity and never replace the bulb again. I think that there are also some LED bulbs designed to replace fluorescent tubes where you have to remove the ballast first but not sure that those are any cheaper than just buying a new LED fixture.

-- Nathan, TX -- Hire the lazy man. He may not do as much work but that's because he will find a better way.

View John Smith's profile

John Smith

874 posts in 157 days


#6 posted 04-18-2018 12:39 PM

ballasts are cheap – remove one and take it to your local hardware store
to get a similar wattage replacement and two new “daylight” bulbs and you will be
back in business with nice bright lights.

-- Graduated Valedictorian from the University of HardKnocks --

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Fresch

228 posts in 1915 days


#7 posted 04-18-2018 12:44 PM

Ballasts aren’t that cheap, dump it and go led daylight ~$20 ea.

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woodbutcherbynight

4515 posts in 2403 days


#8 posted 04-18-2018 03:36 PM

Ballast cost same here locally as getting two quality LED’s drop ins for your current fixture. Once my stock of ballast and 200 bulbs is depleted I plan to convert all fixtures to LED. But that may be awhile. LOL Got my stock from the stockroom of a closed warehouse maint room years ago. For our favorite price of…. FREE.

https://www.homedepot.com/p/GE-120-Volt-Electronic-Ballast-for-4-ft-4-Lamp-T8-Fixture-93885/205409893

-- Live to tell the stories, they sound better that way.

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Karda

1068 posts in 548 days


#9 posted 04-18-2018 05:32 PM

yea, I am going to replace it. I was just hoping thanks Mike

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Redoak49

3239 posts in 1983 days


#10 posted 04-18-2018 05:39 PM

As my fluorescent fixtures are going out or bad, I am replacing it with LESs.

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Karda

1068 posts in 548 days


#11 posted 04-18-2018 05:47 PM

yea I like them better

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Dark_Lightning

3159 posts in 3103 days


#12 posted 04-21-2018 01:59 AM


As my fluorescent fixtures are going out or bad, I am replacing it with LESs.

- Redoak49

Exactly! I’ve tracked the lifetime of the fluorescent bulbs that I use, and the advertised lifetime of 7 years is complete baloney. They generally last less than 2 years. I’ve replaced 4 of 10 fixtures so far.

-- Random Orbital Nailer

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Fresch

228 posts in 1915 days


#13 posted 04-21-2018 02:03 AM


As my fluorescent fixtures are going out or bad, I am replacing it with LESs.

- Redoak49

Exactly! I ve tracked the lifetime of the fluorescent bulbs that I use, and the advertised lifetime of 7 years is complete baloney. They generally last less than 2 years. I ve replaced 4 of 10 fixtures so far.

- Dark_Lightning

How often do you turn them on and off? The rating is for continuous use, also the cheap China junk is… junk.

View MrUnix's profile

MrUnix

6701 posts in 2193 days


#14 posted 04-21-2018 02:07 AM

LED’s have a typical life of about 50,000 hours. However, the electronics that drive them, don’t.

Cheers,
Brad

-- Brad in FL - In Dog I trust... everything else is questionable

View Nubsnstubs's profile

Nubsnstubs

1286 posts in 1724 days


#15 posted 04-21-2018 03:42 AM



LED s have a typical life of about 50,000 hours. However, the electronics that drive them, don t.

Cheers,
Brad

- MrUnix


Yep, a 120 watt Sylvania LED floodlight at 20 dollars each has a 20 year life expectancy. I’ll buy that, but it’s the other stuff converting the power that goes bad. Replaced 3 bulbs in less than three years. Fortunately Lowes guarantees them for 5 years. ............. Jerry (in Tucson)

-- Jerry (in Tucson) www.woodturnerstools.com

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