Neon Signs Sydney is formed from glass tubes bent into particular shapes by experienced glassworkers. Exceptional machines draw out all of the air from the tubes and replace it with noble gases such as neon, argon or helium. Neon signs are somewhat like billboard lights that we can see throughout the town in different shapes and sizes. Neon gas is very bright giving off a red glow while argon light is weak because of its reduced resistance. Argon usually comes in yellow, blue, green and white shades.