Description Brand NIKOLATOYProduct Name Tesla Plasma Reaction Glass Sealed Rare Gas Light emitting Tube SetWhy do different gases emit different colors of light It is because atoms or molecules at high energy levels move their electrons on the sphere closest to the nucleus At this point it has the least energy and is relatively stable When atoms are excited by external factors electrons absorb a certain amount of energy and jump into other high energy orbitals At this time electrons become unstable and can spontaneously jump to low energy orbitals emitting a photon that forms visible light that can be observed by the naked eye Caution The EU UK and AU plug versions are actually shipped with US plug and we will send EU UK or AU adapters with them Package included 1 xTesla Plasma Reaction Glass Sealed Rare Gas Light emitting Tube Set5 xRare Gases helium neon argon xenon OR The UK and AU plug versions are actually shipped with EU plug we will send UK or AU adapters