A special type of fluorescent tube contains the gas helium. When energized, it is lit by certain colors. What is this process where colored light is emitted from an atom? - Quora
Lab 6 - Quantum States for the Visible Hydrogen Atomic Emission Spectrum
Bohr Revisited: Model and Spectral Lines of Helium — Journal of Young Investigators
Philips Spectral - Helium
Solved The emission spectrum of helium is shown below Helium | Chegg.com
Calibrating the Spectroscope: Visible Light Spectroscopy
Lesson Explainer: Emission and Absorption Spectra | Nagwa