The Graham Field diagnostic replacement bulbs are engineered for the Grafco line of medical instruments to provide reliable and accurate lighting during patient assessments. The 901 model is a 3.5V halogen lamp designed for ophthalmoscopes, ensuring high-definition visualization of the retina. The 909 is a powerful 15.1V bulb used in specialized examination lamps for deeper tissue illumination. The 911 model is a 4.6V bulb specifically tailored for vaginal specula illuminator systems, providing the clear, shadow-free light necessary for gynecological procedures. All bulbs are manufactured to strict clinical tolerances to ensure longevity and consistent color temperature.