How to measure the shadowlessness of surgery light

Use 50mmxX75mm black cylinder, place light source 1 meter above it, place a photometer at the bottom of the black cylinder, the measured light/shadow ratio must not be less than 10%, the actual light source used is surgery light with diameter of 50cm to 100cm, only some major performance indicators meet the standards then it can be used. Here are some important performance parameters listed, we can refer to the following standards when buying.

First of all, the most important point is to have sufficient illumination. Now surgery lamp illumination can reach 180,000 Lux, near to the sun brightness in summer. The actual use of illumination generally is between 40,000 – 100,000 Lux, too bright will affect eyesight. Glare on surgical instruments should be avoided while providing adequate illumination, glare affects vision and vision, easy to make the eyes fatigue, adverse surgeon surgery. Surgery lamp illumination and operating room illumination should not have a big difference. Some standards require that the illumination of the overall illumination is one-tenth of the local illumination. The operating room temperature increase should less than 10 Celsius. The main way is to make the visible light generated by the light source through the filter which can filter out 70% infrared, most of the remaining infrared rays are separated and filtered by glass cover. After the above treatment the beam is called cold light.

Secondly, the shadowless lamp has a high degree of shadowlessness, and the shadowlessness is an important feature and performance index of the surgical shadowless lamp. Operating light install a few or a dozen ring evenly arranged light source in 50-100 cm diameter lamp head, special bulbs and reflectors are used in the light source, the beam which from different points meets at one point through filter reflection, to provides balanced, uniform and shadowless bright beam.