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I have devised and am now using, in the treatment of cases by means of concentrated light, a reflector which is so constructed that the direct rays of the sun falling on it are focussed at a distance of eight feet, on an area six inches in diameter, the reflector being thirty inches in diameter. Thus a light is produced equal in intensity to twenty times that of direct sunlight, and covering an area of twenty-eight square inches. As the actinic rays of the sun are desired rather than the heat rays, blue glass is placed in front of the reflector, which permits of the passage of the light in nearly its full strength, but excludes a large percentage of the heat rays. The reflector is mounted on a metal stand which permits of motion in all directions. The light from this reflector is as powerful as it is possible
KIME JW. INSTRUMENT FOR USE IN PHOTOTHERAPY.. JAMA. 1900;XXXIV(19):1173. doi:10.1001/jama.1900.24610190023001f