我院西门子SIREGRAPHD及MUL-TIXCP两台X线机上定位灯均采用24V150W卤素灯泡。其中一台X线机由于专用于拍片，定位灯使用频繁，致使灯泡容易损坏，进口灯泡数月换一只，国产灯泡几乎一周换一只。由于流过灯泡电流大，灯座氧化严重，使接触电阻变大，灯座发烫，更加速了灯泡损坏? Our Siemens SIREGRAPHD and MUL-TIXCP two X-ray machine positioning lights use 24V150W halogen bulbs. One of the X-ray machines is dedicated to filming, and the positioning light is used frequently, which makes the light bulb easily damaged. The imported light bulbs are changed for several months, and the domestically produced light bulbs are changed for almost one week. Due to the large current flowing through the bulb, the lampholder oxidation is severe, the contact resistance becomes larger, the lamp holder becomes hot, and the bulb damage is accelerated.