21. Hydrogen atoms like this are found in stars but also in objects like arc lights . 22. Arc lights have mainly been used where high lumen light was needed such as lighthouses.23. Conventional halogen bulbs, argon lasers and xenon arc lights are currently used in clinical practice. 24. The school is named for Charles F . Brush, the Ohio-born inventor of the arc light . 25. Odlum may have installed the first public telephone in Vancouver and the first electric arc light . 26. Arc lights need carbon electrodes called carbon points ( or simply carbons ) to work.27. By 1811 Davy demonstrated the arc light . 28. The first " Klieglight " was a powerful carbon arc light designed for the motion picture industry. 29. Daniels sometimes used incandescent lights instead of studio arc lights , due to the constraints of his locations. 30. But they are vastly more complicated and depend on microcomputer technologies and powerful xenon arc light sources.
