Light bulb is filled with inert gas or simply a vacuum.
Inert gases.
Light is necessary for the exchange of gases in plants.æ Light is what instigates photosynthesis and without photosythesis there can be no gas exchange.
Noble(nonreactive) gases like argon
the noble gases would be the lightest, as they are all gases
In a vacuum, no gases affect the speed of light. However, when light passes through different mediums like air or water, the presence of gases can cause light to slow down slightly due to interactions with the gas molecules. This is known as the phenomenon of refraction.
Acid
Gases have no definite volume or shape. The air that you breathe, the helium in a balloon, and the neon inside the tube in a neon light are gases.
A light bulb has one of these three gases Neon Argon or maybe Nitrogen.
Uranus was formed from the light gases of the outer solar nebula.
The two gases commonly used in incandescent light bulbs are argon and nitrogen. The gases help prevent the filament inside the bulb from oxidizing at high temperatures, prolonging the bulb's lifespan.
Argon
Uranus