Principles of operation shadowless lamp

Operating shadowless lamp, generally used in the operating room or special lighting for night work, the principle of which is light refraction, and dilute the shadow. The lamp is a bending of the filament in the light, is not limited to point. From a burst of light to the object covered come from some other burst of light does not necessarily have all been blocked.
Led shadowless lamp, generally used in the operating room or special lighting for night work, the principle of which is light refraction, and dilute the shadow.
The lamp is a bending of the filament in the light, is not limited to the point. From a burst of light to the object covered come from some other burst of light is not necessarily all be blocked. Obviously, the larger the area of the luminous object, the smaller the umbra. If we circle around the point of the above tea barrel candles, when the umbra completely disappear, also pale penumbra of sight. According to this principle, the scientists made of surgical shadowless.
Rectilinear propagation of light when the light shines on the opaque objects in the back of the object will form a shadow. Shadow in different places, different times are different. For example, the same person's shadow in the sun sooner or later, long short at noon.Through observation, we can find the middle of the shadow of the object under the led operating lights, especially the dark, surrounded by a slightly lighter. 
Particularly dark shadow Central part we call the umbra, four weeks dark part we call the penumbra. Generated and rectilinear propagation of light principle of these phenomena are closely related.