OT光– also referred to as an操作灯或者surgical lighthead- 是一个medical deviceintended to assist medical personnel during a外科手术by illuminating a local area or cavity of the病人. A combination of several surgical lights is often referred to as a “surgical light system”.

在1850年代中期，operating roomswere built towards the southeast with windows in the ceiling to benefit from natural sunlight as much as possible. The biggest problem was the dependence of lighting and whether aprocedure可以在一天中的时间和天气条件下完成。此外，医生，护士或医疗设备很容易挡住光线。在天花板的四个角上使用镜子来反映朝向手术台的阳光，只会稍微缓解这些问题。

Attempts were made to use anoptical condenser在间接的光中减少heating, but without success. The entrance ofelectric lightsinto the operating room in the 1880s was accompanied by problems. With early electrical technology control of the light emitted was poor. Electric light was still moving and diffuse, with greatheat radiation.

Light-emitting diodesas light sources remove the problem of heat radiation and reduce energy requirements.

中心点上方和下方的20％照明强度的点之间的距离。从最大照明的点（是距光发射表面1米的中心），光度计将向光移动，直到测得的光强度降至最大值的20％。中心和该点之间的距离定义为L1。远离光线的方向上类似测量的距离为L2。无需重新聚焦的无需重新关注的深度是两个距离L1和L2的总和。在2009年出版的第二版IEC标准中，门槛值从20％修订到60％