Hollow cathode lamps are primarily used in instruments for atomic absorption spectroscopy (AAS). Heraeus hollow cathode lamps are designed for optimal performance and characterised by good chemical sensitivity, high spectral response, stable light output and low noise.Service life is an important factor in AAS. Heraeus hollow cathode lamps have a larger internal gas volume than many other products. All hollow-cathode lamps produced by Heraeus have a guaranteed service life of 5000 mA hours, including for elements such as As or Hg.