Resonance mass produces an extensive range of RF excited lamps filled with a variety of gases. In these lamps, the natural "RESONANCE" frequency of the gas is excited by plasma in the bulb. Combinations of the appropriate fill gases and window materials are used to select near monochromatic energies in the 10.6 to 8.4 eV range. Unique sealing and processing technologies developed during work for the US and Japanese space programs yield lamps of exceptionally high stability and output. Burn-in and VUV testing of every lamp ensures the best quality to meet customers' requirements throughout the world.