The electrodes of each noble gas release a specific and characteristic wavelength of photons, which determines the colour the gas will shine in - neon for example glows red/orange. ... This is because argon is the gas that requires the least amount of electrical input to react and thus uses the least energy of all.

Why is neon light red?

When you apply a high voltage to the electrodes, the neon gas ionizes, and electrons flow through the gas. These electrons excite the neon atoms and cause them to emit light that we can see. Neon emits red light when energized in this way. Other gases emit other colors.

Does neon produce red light?

Neon: produces an orange-red light. Using phosphor-colored glass, neon also can be used to create several other colors: Argon: produces a lavender light.