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Fluorescent bulbs can indeed go bad. Most fixture more than say 10 years of age also have a ballast that can also go bad - but that is not common. A weak/failing ballast can give flickering.

In any event, I suggest exploration. Check to see if there is a fixture or box that connects to the AC house current. That box most likely has your ballast. If so I suggest just finding a replacement light fixture. Another option see if you can get a manufacturer and model number for your hood. They should have records on what the light is and hopefully suggestions on replacement/re-bulbing.

I do not share your view that heat is going to be an issue, but I am assuming the original light was certified by UL.

If you explore a bit, consider the option of replacing your fluorescent with an LED.
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