11. His own arc lamps started to be used as military searchlights. 12. The spotlights used were xenon arc lamps requiring 4 kilowatts of power each. 13. Carbon arc lamps operate at high powers and produce high intensity white light. 14. All modern xenon short-arc lamps use a fused quartz envelope with thoriated tungsten electrodes. 15. Initially the company produced scientific apparatus, including microscopes, heliostats, cathetometers, theodolites and arc lamps . 16. The xenon arc lamp is used when a continuous source of radiation is needed. 17. -Light fixtures : Nontraditional chandeliers with colored glass beads, arc lamps ; decorative sconces, candelabras. 18. The case contains a high-powered concentrated lamp ( such as an arc lamp ). 19. The common fluorescent lamp is a low-pressure mercury arc lamp . 20. A drawback of that technology is the warm up time required for arc lamps .
