Hollow-cathode lamp
How well the HCL works and how long it lasts is dependent on the care of operation. When a high voltage is applied, higher currents arise. These higher currents allow for more intense data output but at the same time can produce a number of unexcited atoms in the cloud. These unexcited atoms can interfere with good output data because they are able to absorb the radiation that is emitted from the excited electrons returning to their ground state. This process is called self adsorption. The process of self adsorption results in weaker intensities. Increasing the current too much can also result in a shorter lifetime of the lamp, as well as melting the metal on the cathode thus ruining the lamp.