A lot more efficient version of tungsten lighting is the tungsten-halogen lamp. This uses exactly the same coiled tungsten filament but it burns at a much higher temperature in halogen gas. Consequently, these lamps maintain virtually the identical light output and color temperature throughout their life; they also last longer than traditional lamps and are smaller with regard to their equivalent wattage. Available wattages range from 200 to 10,000 and the most powerful are intended for cinematography; the highest normal wattage for still photographic lights is 2000. The light output is the same as that from a new tungsten lamp of traditional style with the same wattage.
The newer development, particularly relevant to photography, in which camera’s white balance settings may take care of color differences, is high-performance fluorescent. The lamps used are flicker-free, nearly as bright as tungsten, color-balanced …Read More →