How did they test the light bulb?

Answer 1

If by this you mean, how was the first light bulb tested?

Then the answer would be as follows:

They were tested with a simple run in test.

A prototype was created, and then power applied to the fillament. The build was run indefinately until the filament burnt out.

The first prototypes did not last very long at all (a few minutes to a few hours) compared to modern solid state lighting like LED's (Light Emitting Diodes) that have a lifespan that can exceeed 100,000 hours.

The major breakthrough was the use of gasses like xenon and argon (as they are inert) to replace the air. The first light bulbs were simply vacumn bulbs with a filament contatining little or no gas inside at all.

If by this you mean, how was the first light bulb tested?

Then the answer would be as follows:

They were tested with a simple run in test.

A prototype was created, and then power applied to the fillament. The build was run indefinately until the filament burnt out.

The first prototypes did not last very long at all (a few minutes to a few hours) compared to modern solid state lighting like LED's (Light Emitting Diodes) that have a lifespan that can exceeed 100,000 hours.

The major breakthrough was the use of gasses like xenon and argon (as they are inert) to replace the air. The first light bulbs were simply vacumn bulbs with a filament contatining little or no gas inside at all.