A good way to check that your ballast is the culprit is to turn on a voltage detector and hold it next to the wires supplying power to the ballast.
T8 fluorescent light not working.
Like other lighting fixtures fluorescent light fixtures sometimes work improperly.
I have 3 different ballasts and none of them work with the led tubes.
One clue that your ballast is the reason for a non working fluorescent light is the light bulbs struggle to turn on.
Also these dimmers will not work for incandescent fixtures.
A fluorescent light fixture that is not working or working well can be caused by several problems.
You cannot mix fluorescent fixtures and incandescent fixtures on the same dimmer switch.
I got these t8 size led light tubes to replace fluorescent tubes.
A burnt out lamp is the most common reason any light fixture does not light.
As i said in the intro we noticed this happening over a 3 4 week period.
The no part of this question is that the conventional dimmer switches you can purchase at the hardware store are designed for incandescent lighting only not fluorescent lighting.
Fluorescent lights are commonly used because of their low operating cost.
Or you can read the printing on the tube to identify the correct replacement type.
Aside from a burnt tube other factors such as a worn starter and loose or oxidized electrical contacts can contribute to a fluorescent light not working properly.
To replace remove the old tube and bring it to the hardware store.
Diagnosing which problem you have and how best to tackle it is a fairly simple job that you can do on your own.