The output phosphor converts electrons into:

The output phosphor in a fluoroscopic imaging system is designed to convert electron energy into visible light. When the primary electrons emitted from the input phosphor strike the output phosphor, the material emits light photons as a response. This process is crucial because it enhances the visibility of the image produced, enabling better observation and analysis during fluoroscopy procedures.

The efficiency of this conversion directly affects the quality of fluoroscopic images. By translating the energy of incoming electrons into bright, visible light, the output phosphor plays a fundamental role in producing clear images for diagnostic purposes. Therefore, the statement that the output phosphor converts electrons into light photons is fundamentally accurate.