The most popular option to light large areas of buildings. They come in a variety of connection types and power ratings.

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Fluorescent lights dim and flashing

I have a fluorescent light fixture that uses two 40-watt 4' long tubes. It has recently started acting strange. When first turned on, it works fine for a minute or two, then one of the tubes becomes dim and the other becomes dim and flashing. It's not the tubes, as I've replaced those and nothing changed. Someone suggested it might be the ballast. I'm not exactly sure exactly how old the fixture is, but I'd guess it's at least 10 years old and has been used daily for that entire time. Is the problem caused by the ballast, and if so is that something that can be changed, or should I just buy a new fixture?

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An update: I was able to get a replacement ballast at Home Depot. The bad news is the ballast was $18.49, only $1.50 less that a whole new fixture. It took about half an hour to install the replacement ballast. The replacement was successful and the lights are working great now. In my fixture there were eight 18 gauge wires that you have to cut and then attach to the new ballast. I used wire nuts to connect the wires, so it'll be a little easier to replace the ballast again in the future.

That is the normal end-of-life behavior of a fluorescent tube.

You probably ruined the ballast by letting it continue to run while it was flashing.

If the ballast came with the lamp clips on the end of the wires, it is easier to just change out the clips too.

We've had problems for years we are fluorescent lights dimming or not coming on at times of high humidity. Sometimes I can get them on by flipping the light switch off and on several times and out of the three maybe one will only come on. This is been going on for several years and just recently the lights are getting harder and harder to turn on.

The good news is LED lighting is getting cheap fast. You may want to look here.


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The ballast is causing your problem, and it can be changed. You need to remove the original ballast, (after you shut off the circuit breaker) and take it to a lighting place or electrical supply house. Better yet, get the numbers off the ballast first and call. It may take them a little while to cross reference the part number, but they will find you a suitable replacement.

With any luck, the replacement ballast will be the same size as the old one. If it is not, you will need to find a way to secure it to the old fixture. Perhaps you will need to drill new pilot holes and use sheet metal self tapping screws. Rewire the light if you have to, plug in the new ballast, reset the breaker and you should have bright consistent light.

Otherwise, for a few dollars more, you can get yourself a new light fixture


按维修分数 4

Annoyingly true that sometimes it's cheaper to replace whole fixture than the ballast. Arrgh. LED lighting is getting cheap fast, and doesn't seem to include the environmental dangers of mercury (plus whatever evils lurk in the ballasts). Have a look here.


按维修分数 3


That's what I'm afraid I'll find. Home Depot sell the whole fixture for only $20, but at least online they don't list the ballasts separately. Hopefully I can replace just the ballast, even if it costs as much as a new fixture.

That's true, that was my experience also.

I was able to get a replacement that fit in the same mounting tabs as the original ballast. It was wider and taller than the original, but the same length.

Luke, Well how much did the ballast cost? Did it fix the damned problem fixture?

The ballast was $18.49 at Home Depot. It did fix the issue completely, and was a lot less wasteful that throwing the entire fixture away.



If all above fails (which probablywon't) get a new transformer.



按维修分数 0

Sell this ballast to a cinematographer. They'll love you for it.


按维修分数 0


Why? What o they use it foe and how many do you want to buy?



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