How long will a fluorescent tube last?

Typical lamp life for a fluorescent bulb is about 20,000 hours, but this can degrade as a consequence of frequent switching (turning on and off). Burning life is extended if lamps remain on continuously for long periods of time.

When should fluorescent tubes be replaced?

Fluorescent bulbs can go for years without replacement—even when the ends start to blacken. Don’t worry about them until the light they put out starts to weaken.

How long do fluorescent light fixtures last?

Fluorescent light fixtures are commonplace in both residential and commercial settings. Fluorescent light bulbs have a typical lifespan of 8,000 to 15,000 hours, and ballasts often work for more than 50,000 hours. Fixtures made since at least the year 2000 generally do not have a starter, just a ballast.

What is the rated average life span of a fluorescent lamp if it is with an average of 3 hours burning per day?

In a large batch of fluorescents, say 100, when the 50th bulb burns out calculate the 3 hour periods of time and a typical F32T8 fluorescent tube lasts 30,000 hours. But, it the burn time for this same type of lamp is increased from 3 to 12 hours, the lamp will last longer, closer to 36,000 hours.

How do you know when a fluorescent tube is bad?

How to Tell If a Fluorescent Tube Is Bad?

1. Check the ends of the tube. If they appear darkened this indicates the bulb is burned out.
2. Rotate the tube in the fixture if the bulb is not darkened on either end.
3. Remove the bulb from the fixture if the bulb is still not illuminating.

Why do fluorescent lights last so long?

Each time you turn on a fluorescent tube, emission paste begins to fly off the cathode. Once the emission paste has been depleted from the cathode, this signifies the end of life and the tube burns out. Because of this the longer the tube is left on, the less emission paste darts off and the longer the tube lasts.

Should fluorescent bulbs be replaced in pairs?

If they went in as a pair they should be replaced at the same time. Over time the output of a fluorescent tube decreases by over 50\% from when it was new.