Color of light emited by Argon gas is..

Argon gas emits a pale lavender-blue to violet light when electrically excited, due to its dominant emission lines in the blue-violet spectrum (around 420 nm and 470 nm). This color is commonly seen in argon-filled discharge tubes and is why argon is often used in combination with other gases to achieve different lighting effects. The 'Light Blue' option is the closest approximation among the choices.