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The function of the X-ray beam indicator light is primarily to show the operator when the X-ray beam is on. This is a crucial safety feature in radiographic procedures. When the light is illuminated, it clearly indicates that the machine is actively producing X-rays, helping to ensure that the operator and any other personnel in the area are aware of the radiation emission. This awareness is essential for maintaining safety protocols and minimizing unnecessary radiation exposure.

The other options, while related to aspects of radiation safety and management, do not accurately describe the specific function of the beam indicator light. For instance, indicating the intensity of the radiation is typically managed through dosimetry rather than a simple light indicator. Tracking exposure time usually involves a separate timer or counter, and signaling maintenance issues falls under the category of monitoring equipment status, which is not the primary role of the beam indicator light.