31. In the 1920s, carbon arc lamps were sold as family health products, a substitute for natural sunlight. 32. The English engineer William Duddell discovered how to make a resonant circuit using a carbon arc lamp . 33. Arc lamps use high current between two electrodes ( typically carbon rods ) and require substantial maintenance.34. The idea of coating the tube of an arc lamp emitting in the ultraviolet with incandescent emitters. 35. These lenses have a focus of and are lit by a 2, 000 Watts xenon arc lamp . 36. The Revolution has a filament structure, as opposed to most other moving lights, which use arc lamps . 37. Ordinary LED technology does not produce the intensity and high-lumen output characteristics required to replace arc lamps . 38. One of the projects given to Tesla was to develop an arc lamp based street lighting system. 39. Carbon arc lamps consist of two carbon rod electrodes in open air, supplied by a current-limiting ballast. 40. So, it seems like this camera may only be good for shooting inanimate objects under arc lamps .
