Where natural light is insufficient.
There are no gasses used in an electric bulb. What's inside is something known as energy. It is known as this because it gives off light. Neon is a gas that is used in light bulbs.
Usually a Tungsten alloy.
Usually the light bulbs used are resistive components, but the energy savers used now a days are inductive components and they are used because they consume reactive(inductive) less useful power and save useful or real (resistive) power.
They're made of Tungsten.
Domestic light bulbs are simply the light bulbs (usually of the filament type) used in the home.
hydrogen is not used in bulbs it is usually argon or another noble gas. e.g neon
There are several such as Tungsten a metal used in electric bulbs.
Electric bulbs do have the inert gasses inside and not oxygen to avoid explosions.
Different kinds of light bulbs used different gasses. The incandescent bulb uses no gas - it uses a vacuum. Other kinds of bulbs may use nitrogen, argon, neon, or krypton.
Usually tungsten.
Usually tungsten.
Modern bulbs are usually filled with a mixture of argon and nitrogen. More rarely, some bulbs are filled with pure argon, krypton or xenon. The earliest bulbs weren't filled with any gas, but had vacuum inside.