Its mostly Argon and a small amount of mercury. Its the main ingredients inside a flourescent lightbulb, which are used to light up billboards and highway signs. See the related link for more information on flourescent bulbs.
Neon
The gas used to produce red light when an electric current is passed through it is neon.
Neon gas is commonly used in lighted signs to produce a red color light. When an electrical current passes through the gas, it emits a bright red light that is ideal for creating eye-catching signs and displays.
Tubes used for light signs are often filled with a gas such as neon or argon. When an electrical current is passed through the gas, it emits light, producing the bright and colorful signs we see.
You think probably to neon (red light); but other gases can be used.
The gas commonly used to make yellow-green neon signs is neon gas. When an electrical current passes through neon gas inside a sealed glass tube, it emits a bright yellow-green light.
Neon gas is typically used in bright flashing and advertising signs. When an electrical current is applied to neon gas in a tube, it produces a bright red light that is commonly used for eye-catching signage.
Neon gas emits red light when electricity flows through it. This phenomenon is used in neon signs and neon lighting.
The gas used in lighted signs to produce a red color is typically neon gas. Neon glows red when an electric current is passed through it, making it a popular choice for producing vibrant red light in signage.
The gas that emits a bright reddish-orange light is typically neon. Neon gas is commonly used in neon signs and lighting due to its distinctive color when ionized.
A neon gas discharge tube glows orange with electric current and is used for neon signs, including road signs. Neon gas emits a vibrant orange light when electrified, making it ideal for creating eye-catching signage that is easy to see, even in low light conditions.