HMI Lighting For High Speed Photographic Applications

Paul Kiankhooy

doi:10.1117/12.948678

1 February 1989 HMI Lighting For High Speed Photographic Applications

Paul Kiankhooy

Proceedings Volume 0981, High Speed Photography, Videography, and Photonics VI; (1989) https://doi.org/10.1117/12.948678
Event: 32nd Annual International Technical Symposium on Optical and Optoelectronic Applied Science and Engineering, 1988, San Diego, CA, United States

Abstract

High speed photography requires high levels of illumination for good color quality and good color retention. As the frames/second increase, so does the intensity of light required. The HMI is a medium arc, high-efficiency, cool, high-intensity discharge lamp capable of maintaining a 5600 K color temperature at high levels of illumination, with a dramatically reduced level of emitted infrared radiation. The LM-Ballast is designed to take full advantage of the HMI lamp and enhances its performance. The LM-Ballast is a power source installed between the utility power (AC) or battery pack (DC) and the HMI lamp, replacing the more commonly used magnetic ballast. The LM-Ballast provides modified square waves of regulated current. This eliminates flicker problems associated with HMI lamps when used in conjunction with magnetic ballasts. Further, the lamp is operating at cooler internal temperatures and maintains a uniform 5600 K color temperature. The useful life of the lamp is extended from 500 to approximately 2160 hours. The reduction of color temperature, due to ageing, is reduced from 1 K/hr to .3 K/hr. A combination of the HMI lamp and LM-Ballast provides an ideal lighting system for high speed photography. Shooting film at 10,000 fps was performed where no flicker nor shift of color was observed.

Citation Download Citation

Paul Kiankhooy "HMI Lighting For High Speed Photographic Applications", Proc. SPIE 0981, High Speed Photography, Videography, and Photonics VI, (1 February 1989); https://doi.org/10.1117/12.948678

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