gas discharge
For example, the emission spectrum of a gas-discharge lamp can be altered by filling it with (mixtures of) gases with different electronic energy level configurations. Source: Internet
Gas-discharge lamps main Specialized UV gas-discharge lamps containing different gases produce UV light at particular spectral lines for scientific purposes. Source: Internet
In the simplest arrangement, the switch consists of a gas-discharge tube across the input terminals of the receiver. Source: Internet
These colors can be replicated using a gas-discharge lamp containing the same element. Source: Internet