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I bought these replacement bulbs for a light which runs constantly. I don't recall ever changing the bulb before over the last 5+ years, but maybe I did once. When it recently burned out, I ordered this set. The first of these two bulbs only lasted about 6 months. Not impressive.
Update: the second bulb also burned out in record time. Garbage!
My spouse purchased these to match the GE F13T5 Warm White already installed in our kitchen. The light does NOT match at all and as a result changes the wall paint color. The light is brighter than the GE Warm Whites. So, they will be returned.
I was pleased to find the proper replacement bulb for my fixture, but this bulb only lasted ~2700 hours, not the advertised 20,000 hours, and there's no warranty to speak of. I'll look elsewhere next time.