A Lucent Waveguide Electromagnetic Wave Plasma Light Source has a fabrication (1) of quartz with an inner closed void enclosure (2) is formed of 8 mm OD, 4 mm ID drawn tube. It is sealed at its inner and outer ends (3,4). Microwave excitable plasma material is sealed inside the enclosure. Its outer end (4) protrudes through an end plate (5) by approximately 10.5 mm and the overall length of the enclosure is approximately 20.5 mm. The tube (71) from which the void is formed is continued backwards from the inner end of the void enclosure as an antenna sheath (72). The 2 mm thick end plate (5) is circular and has the enclosure (2) sealed in a central bore in it.